Easy data structure and algorithm practice puzzle.
Given two boxes as [x1, y1, x2, y2], return true if they overlap. Touching edges count. It's easier to prove they DON'T overlap: if one box is fully to the left of the other, or fully above it, they're apart. If neither is true, they overlap. Games check boxes like this before doing any expensive collision math.
Solve it three ways: snap the jigsaw pieces together, fill in the blanks, or type it from scratch against the tests. This one is free.
Every line of the solution comes with a note explaining why it is there, and a step by step replay shows the code running. At level 3, where you type it yourself, you can ask for an AI mock interview on this problem that ends with a hiring manager's scorecard.
Then grow it into a real project with the Software Engineer button: this puzzle becomes the Frame Calibrator, a pipeline you can run and download. See every Software Engineer project.
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