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Sortle
Wordle, but for sorting algorithms. You're given an unsorted array; after each guess you see it advanced by one pass, and you have to name the algorithm doing the sorting.
Solo developer AngularTypeScriptNode
A daily puzzle in the shape of Wordle, except the hidden answer is a sorting algorithm. You start with an unsorted integer array, and each guess reveals the array after one more iteration of the real algorithm, so you’re reading the behavior of a sort (does it bubble, does it partition, does it merge?) and reverse-engineering which one it is. It’s the kind of idea that only works because the algorithms each leave a different fingerprint after a single pass.