How the LEGO Tic-Tac-Toe Playing Machine works
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https://beta.ideas.lego.com/product-ideas/96a609c5-bffe-4df9-86a5-dbd005514159Demo and explanation of the mechanisms and inner workings of the LEGO Tic-Tac-T...

This insane mechanical computer plays tic-tac-toe without electronics by implementing simple memory, AND, and OR gates with LEGO.