The game Digit Disguises was created by David K Butler. The rules and motivation for the game are discussed by him here, along with how best to introduce the game to a class.
1) Number range
Letters: A–J (10 letters)
2) Choose mapping
or
Manual mapping
Use each digit in the chosen range exactly once.
Game
Game state:in play
Queries:0
Ask a calculation
Use two different letters.
Guess the mapping
You can use this section to record deductions as you go — nothing happens until you press Submit.
The game Digit Disguises was created by David K Butler. The rules and motivation for the game are discussed by him here, along with how best to introduce the game to a class.