Calculation
A page of sums that reveals a hidden sentence as players solve them.
You bring A sentence 2 min
Theme · Code puzzles
Code puzzle makers: hide the answer behind a lock the class has to earn.
Ciphers, keypads and arithmetic that gate something real — the next station, the homework, the escape-room door. You set the difficulty; the generator keeps it solvable.
7
generators in this theme
1
completion message per activity to hide a reward in
6
station chain in a scavenger hunt? Your call.
Keypad · live preview
Give away characters to dial the difficulty down, and put the reward in the completion message.
Start from what you already have
— pick the input, we shortlist the generators.The code generators
Every generator here works from content you already haveCryptogram
Your sentence, encrypted. Players decipher the code to read the hidden message.
You bring A sentence 2 min
Keypad
A digital lock: players pick the right cards to find the code that opens it.
You bring A code 4 min
Scavenger hunt
A chain of challenges; each one ends in a code that unlocks the next.
You bring Station list 12 min
Sudoku
A sudoku generated in seconds, at the difficulty you choose.
You bring Nothing 10 sec
Times tables
An online multiplication game for the times tables 1 to 12: every right answer colours in a square of a hidden picture, and any multiplication a child misses comes back until it sticks. It prints as a worksheet or a times table chart too.
You bring Nothing 10 sec
Logic puzzle
A short story, a few categories of items, and a grid of crosses and dots. Players work the numbered clues into the grid until every pairing is placed — and every clue set is proved to have exactly one answer, so it never comes down to guessing.
You bring A story and a table of facts 10 min
How teachers use the code theme
Whole-school events
An escape room that fits in a lesson
Chain a scavenger hunt across stations: each one ends in a code that opens the next challenge.
Maths
Drill that ends in a reveal
Calculation exercises hiding a sentence worth reading behind the answers.
Substitute-proof
A lesson that runs itself
A keypad activity with a hidden message behind it needs no teacher explanation — the lock does the instructing.
Activity ideas
All ideas → Calculation
Sums that spell a sentence
Every answer is a letter. Get the sums right and the message writes itself across the top.
Scavenger hunt Premium
Treasure map trail
Your picture, a pin per riddle, and a route that draws itself as each step is solved.
Times tables
Colour in the times tables
The 2, 5 and 10 times tables as a grid with a hidden picture. Every right answer paints part of a rocket, and a finished grid earns a diploma.
Keypad
The lock on the last door
A keypad that opens to one code. Put the clue anywhere you like: in the instructions, in another activity, or on a note under a chair.
Cryptogram
The coded note
A message in cipher that tells them where to go next. One station of an escape room, or the whole of it.
Sudoku
Mini sudoku
A 4 × 4 grid with one solution, and each number confirmed as it goes in. Sudoku for ages five and up.
1 Write the secret
A sentence, a link, a next-step instruction. Everything else is generated around it.
2 Choose the lock
Cipher, keypad, arithmetic or a station chain — and how many freebies you hand out.
3 Watch it open
With tracking on you see attempts live, so you know who is stuck before they tell you.
Questions about code puzzles
Can I chain several puzzles?
Yes — a scavenger hunt strings stations together, each unlocked by the previous code.
Can outcomes carry a reward?
A completion message can hold text, a code for a physical lock, or a link to the next activity.
Do the puzzles work on paper?
Several print cleanly — cryptograms and calculations work as sheets, with the code checked in class.
Other themes
same editor, different kind of thinkingBuild the lock. The class will find the key.
Free for 60 player sessions a month. No card, no trial clock.