Good problem and I love the level idea.
Remove the air bubbles
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
Regular polygon bounded by and bounding a circle
Sorting integers by their digits (Level 2)
Juggler sequence revisited
Mean number of letters per word (Hard)
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