Joost van Velzen built a fully mechanical LEGO machine capable of playing Tic-Tac-Toe without any electronics. The machine uses 52 mechanical logic gates and 204 bits of mechanical memory to process game state and respond with moves. It always starts by taking the center square, and the human player's first move is limited to one of two squares (a corner or an edge), which through board rotation covers all meaningful opening positions. The build is styled after an 18th-century automaton and has been shared on LEGO Ideas.
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