Same issue here as in your third problem. Please check the absolute value of the differences of the computed values with the correct ones. Otherwise, more silly answers (again, like this one :-) will slip through!
Thanks for the catch. I've updated the test suite to check against upper and lower bounds of each answer.
Remove the air bubbles
Pi Estimate 1
~~~~~~~ WAVE ~~~~~~~~~
03 - Matrix Variables 2
Flip the bit
Self-similarity 1 - Every other term
Lights Out 12 - 5x5, three stages, <7 moves
Calculator spelling - Letters to Numbers
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