🐞 Bug Hunt

Every puzzle starts with a program that is almost right. One block is wrong. Run it, watch where the robot stops doing what you expected, and fix that one block.

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Blocks you can use

The program with the bug

    How to hunt a bug
    • Press One step and watch one block at a time.
    • Stop the moment the robot does something you did not expect. That is where the bug lives.
    • Tap a block in the program to remove it, or tap a block above to add one at the end.
    • Tab to a block, then press Enter to add it. In the program, use the arrow keys to move between blocks.
    • Press Delete or Backspace to remove a block. Hold Alt with an arrow key to move a block up or down.