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Puzzle & Thinking Games · 60

Puzzle difficulty is not just solution length. A short solution can be hard if the key idea is hidden, while a long solution can feel easy once the pattern is clear. The category's past supplies the companion fact: Minesweeper turns incomplete information into logic; a number does not reveal a mine, it reveals a constraint on several possible squares around it. A puzzle is a machine for making the obvious wait until you have tried everything else.

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A good piece of useless knowledge

Chess problems are not the same thing as ordinary chess games. A composer can build a position specifically around one elegant forced idea, more like a logic puzzle than a competition. Another rabbit hole starts here: Word ladders were popularized by Lewis Carroll. The idea is to turn one word into another by changing one letter at a time while keeping every intermediate step a valid word.