Medium data structure and algorithm practice puzzle.
Given a puzzle name, return a 32-bit seed. Start at 2166136261. For each character, XOR in its character code, then multiply by 16777619, keeping only the low 32 bits after each step. This is the FNV-1a hash. Two players who open the same puzzle get the same seed, so their boards get cut the same way, and names one letter apart land nowhere near each other.
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 Trip Retention Curve, a pipeline you can run and download. See every Software Engineer project.
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