Code Crackers

A free cryptography game for kids

Mo the Moai and Bleep the robot teach kids aged 5 to 10 how secret codes work, in 6 short lessons (about 10 minutes):

1. The Treasure Chest: A key is a secret that opens a lock, like a password.
2. Try Them All!: Computers can try every key, one by one, until one works.
3. Two-Word Lock: Each extra choice multiplies the number of combinations.
4. The Growing Tower: Each extra secret word multiplies the possibilities.
5. The Smoothie Machine: A hash is easy to make and impossible to undo, which is why an address is safe to share.
6. Your Super Secret: Secrets picked at random are much harder to guess than favorite words.

Every screen can be read aloud. Kids finish with a certificate to print or share. No ads, no accounts, no sign-up, and nothing to install.