1Turn the drum.
Drag the inner ring, or use the arrow buttons. The strip shows the whole note with that shift.
Day 1 · Ciphers and keys
Codebreaker's Desk
Can you break the club's notes?
The Codebreakers Club hid a scavenger hunt in five locked notes. Turn the cipher drum and place letter tiles until each note reads.
Day 1 · The lesson and this game
A weak cipher can be cracked without the key.
A Caesar cipher has only 25 shifts to try. A scrambled alphabet has many more keys, but repeated letters can leave patterns.
Turn the drum, test letter guesses and read the whole note. When those hand methods can't work, use the facts about the note's cipher to explain why.
How to play
2Place letter tiles.
Pick a letter or symbol in the note, then tap a tile or type a letter. Every copy of it changes at once.
3Check the words.
A guess is right only when the words make sense. You can change any tile, any time.
Every note, symbol and key here is made up. Never try to break into real files or accounts.