reasoning
The popular reasoning in Scratch
#01 Fewest-Swaps Number Sort Updated
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Nine number cards get scrambled, and you swap two of them at a time with a click to sort them back into order. Sounds simple enough, but every swap counts toward your move total, which gets compared against a global best score — so swapping randomly quickly racks up wasted moves. Figuring out the smart sequence before you click is what makes this one addictive.