Your mission

A dragon sleeps on a pile of gold, and the treasure is locked five ways. This dragon loves PRIME numbers. A prime has exactly two factors, 1 and itself, so nothing else divides it evenly. 2, 3, 5, 7, and 11 are prime. A COMPOSITE number can be split into smaller numbers multiplied together, like 15, which is 3 times 5. The number 1 is neither. Some composite numbers look very prime. Every clue is somewhere in the cave, so look closely, whisper, and work together.

How to crack a lock

  • Pick any lock from the menu at the top. You can solve them in any order.
  • Read every clue before you start. One clue alone is never enough.
  • Use scratch paper. Draw pictures, make lists, and cross things out.
  • Tap the buttons to build your answer. Then press "Try the lock".
  • A lock will not tell you which part is wrong, so be sure before you try.

My badges

Teacher note

Teachers: type the password to see the answer key.