Activity 05.03: Fix the Reaction Battle

Goal: Fix the code and fill in the blanks so that the Reaction Battle works again.

Success Criteria:

  • The micro:bit runs the program with no errors
  • Two players can compare their reaction speeds using button A and button B
  • The program doesn’t end until one player presses a button, after the single LED comes on


  • Use the documentation
  • Fill in the blanks below
  • Fix the bugs in the code
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