This was a fun problem, but I think lookup table solutions are possible given the way the way the test suite is configured. Maybe you could add a string parser to see if the test suite correct solutions are included in the answer code?
Make a checkerboard matrix
Make a run-length companion vector
Determine the square root
Return the sequence element I
Increasing sub-sequence (Level 2)
Regular polygon bounded by and bounding a circle
Sorting integers by their digits (Level 4)
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