Calculation
A page of sums that reveals a hidden sentence as players solve them.
You bring A sentence 2 min
Theme · Code puzzles
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.
5
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 One 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
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.
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.