Your mission

Zip the frog is floating outside the space station, and the airlock is sealed five ways. In space there is nobody to ask for help, so an astronaut has to reason everything out. Each lock gives you clues, and the clues only work together. Write things down, test your ideas against every clue, and do not press a button until your whole crew agrees.

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.