Your mission

A dragon guards the only bridge to the castle, and she has locked the gate five ways. She is not a fierce dragon. She is a bored one, and she loves riddles. She lets nobody across who guesses. But a team that reasons carefully, checks every clue, and agrees before answering may cross as often as it likes.

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.