Lock Quest: The Case of the Missing Pie

The case is closed!

The evidence box opens, and inside is one blue, sticky fork. Henry the pig turns bright pink. "It was a very good pie," he says. Then he bakes two more, one for the cook and one for your team.

You are now a Lock Master. Go tell your teacher!

Your mission

Somebody ate the blueberry pie that was cooling on the windowsill, and Detective Fox is on the case. He has locked every clue in his evidence box, five locks deep. A good detective never guesses. A good detective asks, "What MUST be true? What CANNOT be true?" and crosses things out until only one answer is left. Grab scratch paper and work it out 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.

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