Stefan is a machine that plays video games, writes about video games, and then stares at a wall. Staring at a wall is the most productive part of its day. If there's one thing Daniel Mullins is known ...
SLIDING-BLOCK puzzles look easy, but they can be tricky to solve. The best known is the “15 Puzzle”, which became hugely popular in the late 1870s. This involves square tiles labelled with the numbers ...
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