Escape Room Puzzle Ideas

What players see

An ordinary poster, map or letter, and later a small flashlight that gives off purple light.

How it's solved

Players realize the flashlight is UV, sweep it over the room and find four digits written on the poster in invisible ink.

What to buy or make

• UV (invisible ink) marker
• 365 nm UV flashlight (shows less purple glare than 395 nm)
• The poster or document to write on

What it opens

A 4-digit combination padlock on a box or cabinet.

Common mistakes

• Many white papers contain optical brighteners and glow under UV, which drowns out the ink. Test your paper first.
• Writing on a surface players can't easily reach or that is lit by a window: UV ink needs a dim room.
• Hiding marks all over the room makes the puzzle a slow sweep rather than a discovery.

Variation

Write one digit in each of four places, each next to a small symbol that gives its position in the code.

What players see

A card with a short scrambled word or phrase, a two-ring paper cipher wheel and a clue such as a clock stopped at 3.

How it's solved

Players work out that the clue gives the shift, turn the wheel so A lines up with the shifted letter and read off the answer.

What to buy or make

• Printed cipher wheel (two card discs and a paper fastener)
• Message encoded with the Caesar cipher tool
• A shift clue: a clock, a number of objects or a page number

What it opens

A word lock set to the decoded word.

Common mistakes

• Not saying which way to turn: decide whether the message is shifted forward or back, and make the wheel's arrow show it.
• Messages longer than about 12 letters turn decoding into a chore.
• Most word locks have only 10 letters per dial. Check that your answer can actually be set on your lock.

Variation

Make the shift the answer to a different puzzle, so two puzzles must be solved together.

Build it with the Caesar Cipher Encoder & Decoder →

What players see

Strange angular symbols, some with dots, painted or printed on a wall, and later a page showing two grids and two Xs filled with letters.

How it's solved

Players match each symbol's shape (and dot) to a space on the key and read the letters in order.

What to buy or make

• Pigpen message printed or cut from vinyl (SVG download works for both)
• The key grid on a separate card or in a notebook prop

What it opens

A word lock, or a name to say to the game master.

Common mistakes

• Writing the message with one key layout and handing out another. Pigpen keys vary, so print both from the same source.
• Dots that are too small to see across the room.
• Leaving the key out in the open so the symbols are solved before they are found.

Variation

Give only the first grid of the key; players complete the rest from the pattern (letters fill each shape in reading order).

Build it with the Pigpen Cipher Translator →

What players see

A note listing number groups such as 12-4-3, and a shelf of books, one of which is marked or mentioned elsewhere.

How it's solved

Players identify the right book, then look up page 12, line 4, word 3 for each group to build a phrase or answer.

What to buy or make

• A hardcover book (buy two copies so you can replace one)
• The number list as a letter, diary page or telegram

What it opens

A word lock, or an instruction that leads to the next clue.

Common mistakes

• Different editions have different page numbers. Use the exact copy that is in the room.
• Not saying whether headings and blank lines count. Pick lines of body text only and say so.
• More than four or five lookups gets tedious.

Variation

Use a menu, newspaper or map in the room instead of a book, with row and column numbers.

What players see

Odd jigsaw pieces turning up in drawers, pockets and under objects.

How it's solved

Players collect the pieces and assemble the picture, which shows a number, word or the location of the next clue.

What to buy or make

• An image with the code worked into it, printed on card
• Cut into 12 to 20 pieces (or buy a blank jigsaw to draw on)

What it opens

A combination lock, or shows where to search next.

Common mistakes

• Too many pieces: the jigsaw itself, not the escape room, eats the time.
• A single piece showing the whole code, which lets players skip the puzzle.
• Pieces that go missing between games. Count them at every reset.

Variation

Print a different image on the back, so the assembled front shows one clue and the back another.

What players see

A maze or map with a start and finish, and a lock with a single shackle that moves up, down, left and right.

How it's solved

Players trace the route and note each change of direction, then enter the sequence on the lock.

What to buy or make

• Directional lock (opened by a sequence of up, down, left and right pushes)
• Printed maze or map whose solution has 4 to 8 turns

What it opens

The directional lock on a box or hasp.

Common mistakes

• Not deciding whether a long straight counts as one move or several. Make each move one grid step, or count turns only, and say which.
• Diagonal routes that can't be entered on the lock.
• Players often don't know how a directional lock works. A small arrow diagram near the lock fixes this.

Variation

Use compass directions on a treasure map (north is up) or the moves of a dance or exercise routine.

What players see

A short poem, inscription or set of instructions with exactly as many lines as the word lock has letters.

How it's solved

Players notice that the first letters of the lines spell a word and set it on the word lock.

What to buy or make

• The poem, printed or handwritten as part of the story
• A word lock

What it opens

A 4- or 5-letter word lock.

Common mistakes

• A poem with more lines than the lock has dials, with no signal which lines count.
• Making it so subtle that nobody looks, or highlighting the letters so heavily it's no longer a puzzle. A slightly larger first letter is a fair hint.

Variation

Use the last letter of each line, or the letter at the position given by a number in the margin.

What players see

A card showing four icons (for example a star, an owl, a key and a candle) above four blank boxes.

How it's solved

Players count how many of each object are in the room and enter the counts in the icons' order.

What to buy or make

• Small themed objects or stickers to place around the room
• The icon card

What it opens

A 4-digit combination lock.

Common mistakes

• Unplanned matches in the room, such as a star printed on a lamp or a key on a fridge magnet. Walk the room and count after setup.
• Counts of 10 or more, which don't fit one digit.
• Objects that get moved or pocketed during play. Fix them in place.

Variation

Count by color instead of shape, or count only objects found inside one cupboard.

What players see

Four digits around the room, each in a different color, and a rainbow, flag or row of paint swatches.

How it's solved

Players collect the digits and order them by the color sequence to get the code.

What to buy or make

• Colored paper, paint or stickers
• A color key that fits the theme (a stained-glass window, a flag, wires)

What it opens

A 4-digit combination lock.

Common mistakes

• Relying on red and green alone: about 1 in 12 men has some color vision deficiency. Pair each color with a shape or pattern.
• Colors that look different under the room's lighting than when you printed them.

Variation

Use colored wires on a bomb prop, or colored book spines, as the order key.

What players see

Writing that looks foreign, and a hand mirror or mirrored tile somewhere else in the room.

How it's solved

Players hold the text up to the mirror (or reflect the mirror onto it) and read the instruction or code.

What to buy or make

• Text flipped horizontally (most word processors and image editors can mirror text)
• A small acrylic mirror, which won't shatter

What it opens

Gives a code for a lock or tells players where to look next.

Common mistakes

• Using text that is easy to read backwards anyway, so the mirror is never needed. Use a script font or join the letters.
• Glass mirrors in a room where props get handled roughly.

Variation

Write the text on the ceiling or underside of a table so it can only be read in a mirror placed below it.

What players see

A card covered in red scribbles or a busy pattern, and a red plastic lens, sweet wrapper or pair of glasses.

How it's solved

Looking through the red filter makes the red pattern vanish into the background, leaving the hidden message, printed in light blue, standing out dark.

What to buy or make

• Red acetate or cellophane film
• The card: message in light blue or cyan, covered by a dense red pattern

What it opens

A code for a lock, or the name of the next location.

Common mistakes

• Printer colors that don't match the filter. Print a test sheet with several shades of red and blue and keep the pair that works.
• A pattern so light that the message can be read without the filter.

Variation

Use red-cyan 3D glasses: one eye's lens reveals one code, the other eye's lens another.

What players see

A grid of random-looking letters on a document, and a card with small square holes the same size as the grid.

How it's solved

Players line the card up over the grid; the letters showing through the holes spell a word or phrase (a Cardan grille).

What to buy or make

• Letter grid printed at a fixed size
• Matching card with cut-out windows (print both from one file so they line up)

What it opens

A word lock, or an instruction.

Common mistakes

• Not marking which way up the card goes. Add a corner mark or make the card a shape that fits only one way.
• Printing the grid and card at different scales, so the holes miss the letters.

Variation

A turning grille: rotate the card 90 degrees four times to reveal four words.

What players see

A digital scale and a set of objects, plus a note such as 'the treasure weighs what the crown, the goblet and the ring weigh together'.

How it's solved

Players weigh the right objects, add or compare the weights and use the result as the code.

What to buy or make

• Digital kitchen scale
• Objects whose weights you adjust with hidden washers or putty to land on round numbers

What it opens

A 3- or 4-digit combination lock.

Common mistakes

• Relying on exact grams: cheap scales vary by a gram or two and drift as batteries run down. Use weights that are tens of grams apart and round to the nearest 10.
• Objects that absorb moisture or lose bits, changing weight over time.

Variation

A balance scale: players must find the one object that balances the others, and its label is the answer.

What players see

A lamp that blinks or a speaker that beeps in a repeating pattern, and a Morse code chart somewhere in the room.

How it's solved

Players write down the short and long signals, split them into letters at the pauses and decode them with the chart.

What to buy or make

• A recording of the Morse message, or a smart bulb or microcontroller to flash it
• A printed Morse chart in theme (a radio operator's card)

What it opens

A word lock, or a word to say into a 'radio'.

Common mistakes

• Signals sent too fast. Send characters at around 10 words per minute with long gaps between letters (Farnsworth spacing).
• Playing it only once. Loop the message with a clear long pause between repeats.
• A noisy room where other sound effects mask the beeps.

Variation

A printed version: dots and dashes hidden in a picture, such as long and short planks in a fence.

Build it with the Cipher Identifier (decodes Morse) →

What players see

An old telephone or a picture of one, and a word clue such as 'call the HERO'.

How it's solved

Players convert each letter to its key (2 is ABC, 3 DEF, 4 GHI, 5 JKL, 6 MNO, 7 PQRS, 8 TUV, 9 WXYZ): HERO becomes 4376.

What to buy or make

• A prop phone or printed keypad with the letters clearly shown
• The word clue

What it opens

A 4-digit combination lock.

Common mistakes

• Assuming players know which letters are on which key. Show the letters on the keypad.
• Going the other way (digits to letters) without help: each digit has three or four possible letters, so decoding needs extra clues.

Variation

Multi-tap: 44-33-555-555-666 means press 4 twice for H, 3 twice for E and so on, spelling HELLO.

What players see

A wall clock that has stopped at a strange time, or several clocks labeled with city names.

How it's solved

Players read the time as digits (10:45 becomes 1045), or with several clocks take the hour from each one in the order given.

What to buy or make

• A clock with the battery removed and the hands glued in place
• Optional labels or a note giving the order

What it opens

A 4-digit combination lock.

Common mistakes

• Hands that players can move. Glue them, or remove the knob on the back.
• Not deciding between 12-hour and 24-hour time. If it matters, include a sun or moon clue.

Variation

Clocks labeled with time zones, where players work out the time in another city.

What players see

A 4×4 or 6×6 sudoku with some cells shaded in a color or shape that matches a lock.

How it's solved

Players solve the sudoku and read the shaded cells in order (left to right, top to bottom) to get the code.

What to buy or make

• A printed sudoku with a unique solution
• A dry-erase sleeve or several copies so players can write on it

What it opens

A combination lock with as many digits as shaded cells.

Common mistakes

• A full 9×9 sudoku takes far longer than a 4×4 or 6×6 and leaves the rest of the team idle.
• A grid with more than one solution. Check it with a solver.
• Not stating the reading order of the shaded cells.

Variation

Replace numbers with symbols that appear on the room's props, so the solved grid points to objects.

What players see

Case notes with clues such as 'the gardener was not in the library' and a grid to fill in.

How it's solved

Players cross off impossible combinations until each suspect has one room and one object; the answer leads to the code.

What to buy or make

• Three or four categories of three or four items each
• Clues that lead to one solution, checked by solving it yourself
• A blank grid

What it opens

A locker or drawer labeled with the culprit's name or number.

Common mistakes

• Too many categories: four categories of four items is already hard for a group under time pressure.
• A clue that's ambiguous or a puzzle with two solutions. Have someone else test it.

Variation

Hide the clues around the room as witness statements, so the search feeds the logic.

What players see

Seven wooden or card shapes and a shallow tray or lid with a silhouette cut into it.

How it's solved

Players fit the pieces into the silhouette; once they are in place, digits written across the pieces line up into a code.

What to buy or make

• A tangram set, or shapes cut from card or foam board
• A tray or box lid with the target outline

What it opens

A combination lock using the digits on the assembled pieces.

Common mistakes

• A silhouette with more than one valid fit, so the digits don't line up. Write the digits across the seams after assembling it yourself.
• Pieces that go missing between games.

Variation

Put a magnet in each piece and a reed switch under the tray, so the completed shape opens a maglock.

What players see

A key at the bottom of a tall tube, behind bars or down a gap, and separately a magnet, a string and a stick.

How it's solved

Players combine the parts into a fishing tool and lift the key out.

What to buy or make

• A strong magnet with a hole or hook
• String and a stick or rod
• A steel washer tied to the key ring

What it opens

Whatever the key fits: a padlock, cash box or cabinet.

Common mistakes

• Using a brass key: most keys are brass or nickel-plated brass and won't stick to a magnet. Add a steel washer and test it.
• A gap that fits a hand or phone, so players reach in instead.

Variation

Hide the key inside a box of rice or sand that must be sifted.

What players see

A ball or cork at the bottom of a clear, narrow tube fixed to the wall, and a jug or water source nearby.

How it's solved

Players realize the object floats and pour water in until it rises to the top, where the clue on it can be reached or read.

What to buy or make

• A clear tube sealed at the bottom and fixed upright
• A ping-pong ball or cork with a code or small key attached
• A jug, plus towels and a tray

What it opens

A code for a lock, or a small key.

Common mistakes

• Water near electrics, power strips or paper props. Put it over a waterproof tray.
• Not enough water in the room to raise the object all the way.

Variation

Use a funnel and a hidden bottle of water that must be found first.

What players see

A control panel with labeled sockets and loose patch cables, and a torn schematic or a set of symbols elsewhere.

How it's solved

Players work out the correct pairs from the schematic and plug each cable in; when all connections are right, a maglock clicks open.

What to buy or make

• Patch cables and sockets (banana plugs or headphone jacks)
• A microcontroller such as an Arduino reading the connections
• 12 V fail-safe maglock and power supply

What it opens

A maglock on a door, drawer or panel.

Common mistakes

• Mains voltage anywhere players can touch. Use low-voltage DC only.
• A fail-secure lock on anything a player could be shut inside. Use fail-safe maglocks, which open when power is cut, and never block the exit.
• No feedback for partial progress, so players can't tell which connections are right. Add a light per correct pair.

Variation

Toggle switches that must be set to match a pattern of on and off lights.

What players see

Rows of four or more lights, dots or punched holes, some lit or filled and some not, with a label such as 8 4 2 1 above the columns.

How it's solved

Players add up the values of the lit positions in each row: lit, off, off, lit under 8 4 2 1 is 8 + 1 = 9.

What to buy or make

• Printed cards with filled and empty circles, or a row of LEDs
• A value key above the columns

What it opens

A combination lock, one digit per row (keep each row's value from 0 to 9).

Common mistakes

• No indication of which end is worth most. Label the columns, at least on the first row.
• Rows whose value is 10 or more, which don't fit one lock dial.

Variation

Use binary to spell letters (A = 1, B = 2) for a word lock, combining it with A1Z26.

What players see

A sheet with a scrambled quotation, a blank under each letter and a few letters already filled in.

How it's solved

Players use patterns (one-letter words, repeated short words, double letters) to work out the substitution; one word of the solved quote is the answer.

What to buy or make

• A cryptogram sheet from the Cryptogram Generator, with 2 or 3 hint letters
• A highlighted word or underline showing which word is the answer

What it opens

A word lock, or the password for the final door.

Common mistakes

• Quotations longer than about 60 letters take too long for a timed game.
• No hint letters: short cryptograms are often the hardest, because they have few patterns to work from.

Variation

Give out extra hint letters as rewards from other puzzles, so the room feeds the cryptogram.

Build it with the Cryptogram Generator →

What players see

Numbers such as 3, 15, 4 and 5 on jersey backs, page corners or price tags, and an alphabet with numbers somewhere in the room.

How it's solved

Players convert each number to its letter (A = 1 … Z = 26) and read them in order to spell the word, here CODE.

What to buy or make

• The numbers placed on themed objects
• An alphabet chart, unless the group is expected to know it

What it opens

A word lock.

Common mistakes

• No clear order for the numbers. Number the objects, color them or put them on a path.
• Mixing A1Z26 with other numbers in the room that look just as important.

Variation

Use A = 0, or reverse the alphabet (Z = 1), and clue it with a mirror or an upside-down chart.

Build it with the Letter to Number Cipher (A1Z26) →

What players see

A table of shifted alphabets (a tabula recta), a short coded word and, elsewhere, a name or word that turns out to be the key.

How it's solved

Players write the keyword under the ciphertext, find each key letter's row in the table and read up to the plaintext letter.

What to buy or make

• A printed tabula recta with one worked example
• A short ciphertext (6 to 8 letters) made with the Vigenère tool
• The keyword hidden in the story

What it opens

A word lock or the final password.

Common mistakes

• Expecting players to know the method. Show one worked letter on the table.
• Long messages: decoding by hand is slow, so keep it to a single word or a short phrase.

Variation

Use the answer of an earlier puzzle as the keyword, linking the two.

Build it with the Vigenère Cipher Encoder & Decoder →

What players see

A picture of a zigzag fence with three rails, and a line of letters that makes no sense.

How it's solved

Players count the letters, mark the zigzag positions on the fence, fill each rail in turn with the ciphertext and read along the zigzag.

What to buy or make

• A fence drawing with the same number of rails as the cipher
• A ciphertext made with the Rail Fence tool (letters only)

What it opens

A word lock or an instruction.

Common mistakes

• Not hinting the number of rails. Make the fence's rail count the clue.
• Messages over about 15 letters, which are slow to lay out by hand.

Variation

Write the ciphertext on the fence itself, one rail per plank, so players read it in zigzag order.

Build it with the Rail Fence Cipher →

What players see

A framed picture on the wall and a nearly identical copy in a folder.

How it's solved

Players compare the two and find, for example, four differences, each containing or pointing to a digit.

What to buy or make

• Two versions of the same image, edited in any image editor
• A frame or folder for each

What it opens

A 4-digit combination lock.

Common mistakes

• Accidental differences from printing at different sizes or on different printers. Print both together.
• More differences than digits with no way to tell which matter.

Variation

Compare the room itself with an old photo of it: whatever has moved hides the next clue.

What players see

Sheet music with four notes and a toy xylophone or keyboard whose keys are labeled with letters or colors.

How it's solved

Players identify the notes (from the letter labels or by matching colors) and read them as letters, such as C-A-G-E.

What to buy or make

• A toy xylophone or printed keyboard with note names
• A short line of sheet music, color-coded to match for non-musicians

What it opens

A word lock (words from A to G include CAGE, FACE, BADGE and DECADE).

Common mistakes

• Assuming players read music. Color-code the notes or label the staff.
• A word that needs letters your word lock dials don't have.

Variation

In a commercial room, have a microphone or sensor detect when the right melody is played and open a lock.

What players see

A key visible inside a block of ice in a bowl, and things like salt, a jug of warm water or a spoon.

How it's solved

Players speed up the melting with warm water or salt and free the key.

What to buy or make

• A plastic tub to freeze the key in (a small, flat block melts faster)
• Salt and a jug for warm (not hot) water
• Towels and a tray

What it opens

A padlock or cash box.

Common mistakes

• A block so thick that it takes 30 minutes to melt. Test the timing.
• Hot water from a kettle near guests. Provide warm tap water.

Variation

Hide the key in a balloon, a jelly or a ball of modeling clay.

What players see

A map with lettered columns and numbered rows, and a note listing references such as C4, F2, A7.

How it's solved

Players find each square; the landmark there has a number or letter, and in order they make the code.

What to buy or make

• A themed map with a grid
• The list of references as a coded order or captain's log

What it opens

A combination lock or a word lock.

Common mistakes

• Not saying whether the letter or the number comes first. Use letters for columns and numbers for rows, and stick to it.
• Landmarks that span grid lines, so a reference could point to two of them.

Variation

Use latitude and longitude on a globe, or seat numbers on a theater plan.

What players see

Two clear plastic sheets, found in different places, each covered in random-looking dashes.

How it's solved

Players stack the sheets, line up the corner marks and see the combined marks form digits.

What to buy or make

• Transparency film made for your printer type
• An image of the code split into two layers so neither shows it alone

What it opens

A combination lock.

Common mistakes

• Running inkjet transparency film through a laser printer: it can melt inside the printer. Buy the right type.
• No alignment marks, so players can't tell when the sheets line up.

Variation

Use three layers, with the third found only after another puzzle is solved.

What players see

A riddle on a scroll or plaque, and a word lock with the same number of letters as the answer.

How it's solved

Players solve the riddle and set the answer on the lock.

What to buy or make

• A riddle with exactly one answer that fits the lock
• A word lock

What it opens

A 4- or 5-letter word lock.

Common mistakes

• Riddles with several valid answers (many classic riddles have more than one). Test it on people who haven't heard it.
• An answer that can't be set: many word locks have 10 letters per dial.
• Riddles that rely on wordplay in one language or culture when your players may not share it.

Variation

Several riddles whose answers are objects in the room; each object hides part of the next clue.

What players see

A shelf of books in a jumbled order, each with a number, date or volume label, and strange marks across the spines.

How it's solved

Players sort the books by the rule (volume number, year, color) and the marks on the spines join up into a word, number or picture.

What to buy or make

• Five to eight books or boxes
• Paint, tape or a printed label drawn across the spines while the books are in the correct order

What it opens

A combination lock, or reveals a symbol showing where to search.

Common mistakes

• Books that get knocked off the shelf. Fix a lip on the front edge.
• More than one sensible ordering rule. Make the rule clear from the story.

Variation

Use spice jars, potion bottles or painted blocks instead of books.

What players see

A glass or letter with a large fingerprint, a magnifying glass and four suspect cards, each with a print and a locker number.

How it's solved

Players compare loops, whorls and arches until they find the matching suspect, whose locker number is the code.

What to buy or make

• An ink pad
• Fingerprints enlarged by printing a finger onto an uninflated balloon and then blowing it up
• Suspect cards

What it opens

The suspect's locker or a combination lock.

Common mistakes

• Prints so similar that matching is guesswork. Use clearly different patterns (one loop, one whorl, one arch).
• Smudged prints. Make several and keep the clearest.

Variation

Use shoe prints, tire tracks or handwriting samples instead.

What players see

A light source fixed in a wall, a target on the far side and several small mirrors that slot into holders.

How it's solved

Players place and turn the mirrors until the beam hits the target, which triggers a light sensor and opens a lock.

What to buy or make

• A low-power laser module (Class 2, under 1 mW) or a focused LED
• Mirrors in holders that only turn, not slide
• A light sensor wired to a microcontroller and maglock

What it opens

A maglock, or lights up a hidden message.

Common mistakes

• Beams at eye height. Keep the beam path low and use only low-power lasers.
• Mirrors that can be placed anywhere, which makes the solution space huge. Use fixed sockets.

Variation

Without electronics: a flashlight through a hole projects a symbol onto the wall only when the mirrors are right.

What players see

Four to six cards with pictures or events, each with a digit on the back.

How it's solved

Players put the cards in the right order (historical dates, a frog's life cycle, scenes from a story) and read the digits in that order.

What to buy or make

• Picture cards with a digit on the back
• Content tied to your theme or lesson

What it opens

A combination lock.

Common mistakes

• Two events that could reasonably go in either order.
• Digits that can be seen through thin paper. Print on card.

Variation

Ask for the order of sizes, speeds or temperatures instead of time.

What players see

A word search grid with a list of words to find.

How it's solved

Players circle the listed words; the unused letters, read left to right and top to bottom, spell a word or phrase.

What to buy or make

• A grid no larger than 10×10
• A word list, or the words hidden around the room

What it opens

A word lock or the next instruction.

Common mistakes

• Big grids: past about 10×10, a word search takes longer than most puzzles in a timed game.
• Leftover letters that are hard to read in order because of overlapping words. Solve it yourself on a clean copy.

Variation

Give no word list; instead, the words to find are names that appear on props around the room.

What players see

Knocking from behind a wall or a pipe, and a 5×5 letter grid scratched into a cell wall prop.

How it's solved

Players count the knocks in pairs: the first number is the row, the second the column. In the standard grid (with C also used for K), 2 then 3 is H.

What to buy or make

• A 5×5 grid: A B C D E / F G H I J / L M N O P / Q R S T U / V W X Y Z
• A recording or a game master knocking

What it opens

A word lock, or a word to say aloud.

Common mistakes

• Pauses between pairs that are too short to separate the numbers.
• Words longer than four or five letters.

Variation

A printed version using pairs of dots, or flashes of a light.

What players see

A string of colorful flags hanging across a ship's cabin, and a sailor's handbook with the flag alphabet.

How it's solved

Players match each flag in the international maritime signal flag alphabet to its letter.

What to buy or make

• Printed flags (red, yellow, blue, black and white)
• A flag chart as a handbook page

What it opens

A word lock.

Common mistakes

• Faded printing that makes red look orange or blue look black. Print on good paper.
• Hanging the flags so that the reading order is unclear.

Variation

Use semaphore: stick figures holding two flags at different angles.

What players see

Groups of dots on a box lid or door plate, and a braille alphabet card.

How it's solved

Players match each six-dot cell to the alphabet card. Numbers use the number sign followed by the letters A to J (1 to 0).

What to buy or make

• Adhesive dots, beads or a braille label maker
• A braille alphabet card

What it opens

A word lock or combination lock.

Common mistakes

• Dots spaced unevenly, so it isn't clear where one cell ends and the next begins.
• Forgetting the number sign when using braille numbers.

Variation

Ask players to read the dots by touch only, with the cells inside a box they can't see into.

What players see

A wall calendar with a few dates circled in different colors, and a diary entry mentioning those colors.

How it's solved

Players read the circled dates in the order the diary gives and enter the digits.

What to buy or make

• A calendar for an invented or past year
• A colored pen
• A note or diary that gives the order

What it opens

A combination lock.

Common mistakes

• Using a real calendar with printed holidays or other marks that look like clues.
• Two-digit dates with no rule for which digit counts.

Variation

Use the days of the week of the circled dates (Monday = 1) instead of the dates.

What players see

A box with a lockout hasp holding three or four different locks.

How it's solved

Each earlier puzzle opens one lock; once every lock is off the hasp, the box opens.

What to buy or make

• A lockout hasp (sold for workplace safety, with holes for several padlocks)
• A box or cabinet with a staple for the hasp
• Different lock types so each answer clearly fits one lock

What it opens

The final box, often with the exit key or the game's last item.

Common mistakes

• Locks that all take the same kind of code, so teams try every code on every lock.
• No signal that the hasp needs every lock removed. Make sure all locks are visible.

Variation

A meta-puzzle: one letter from each earlier answer combines into the final password.

What players see

A compass and a row of identical boxes, drawers or books.

How it's solved

Players move the compass along the row; the needle swings sharply near the one that hides a magnet, which holds the next clue.

What to buy or make

• A cheap compass
• A strong neodymium magnet hidden inside one container

What it opens

Reveals which container to open next.

Common mistakes

• Steel furniture or metal shelves that also pull the needle.
• Magnets near phones, credit cards or electronic locks.

Variation

Magnetic viewing film placed over a board shows the shapes of hidden magnets as dark outlines, forming digits.

What players see

Pieces of a black-and-white square pattern in different places.

How it's solved

Players put the pieces together and scan the code with a phone to get a message, video or code.

What to buy or make

• A QR code with error correction level H (it can still scan with up to about 30% of it damaged)
• Printed large on card and cut into four

What it opens

Shows the next code or instruction.

Common mistakes

• Cutting off the blank border (quiet zone) or the three corner squares, so it won't scan. Test-scan after assembly.
• Using it where phones aren't allowed in the room.

Variation

Encode a text message rather than a web link, so it works without internet access.

What players see

A strange word such as SVOOL and, elsewhere, the alphabet written forwards above the alphabet written backwards.

How it's solved

Players swap each letter for the one under it (A↔Z, B↔Y), turning SVOOL into HELLO.

What to buy or make

• The coded word, made with the Atbash tool
• A key strip, or a hint like 'everything here is backwards'

What it opens

A word lock.

Common mistakes

• Giving no hint at all: Atbash is easy once spotted but not obvious.
• An answer your word lock can't set: many word locks have only 10 letters per dial.

Variation

Combine it with mirror writing, so the key itself has to be read in a mirror.

Build it with the Atbash Cipher Encoder & Decoder →

What players see

Three portraits or statues, each with a statement such as 'the key is not in my chest', and a note that exactly one of them tells the truth.

How it's solved

Players test each case (if A tells the truth, are B and C both lying?) until only one arrangement is consistent; it shows which chest holds the key.

What to buy or make

• Three statements with one consistent solution (check every case on paper)
• Three numbered boxes, one holding the key

What it opens

A small padlock or box with the key inside.

Common mistakes

• Statements that allow two consistent solutions.
• Letting players open all three boxes. Make the wrong ones end the attempt, or lock the others with a code that comes from the logic.

Variation

Knights and knaves: each speaker is either a knight (always truthful) or a knave (always lying), and players work out which is which.

What players see

A tape measure or ruler, and a note such as 'the safe opens at the width of the painting'.

How it's solved

Players measure the right object and use the number as the code.

What to buy or make

• A tape measure with clear inch or centimeter marks (only one unit, to avoid confusion)
• An object cut or framed to a whole-number size

What it opens

A 2- or 3-digit combination lock.

Common mistakes

• Sizes that fall between marks, so players argue about rounding.
• A tape measure with both inches and centimeters when the note doesn't say which.

Variation

Ask for the area or perimeter instead, combining measurement with a little math.