--- title: LEGO Machine Plays Tic-Tac-Toe Without Electronics description: 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... canonical: https://daily.dev/posts/lego-machine-plays-tic-tac-toe-without-electronics-lj3tdymbk twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: LEGO Machine Plays Tic-Tac-Toe Without Electronics | daily.dev og:description: 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... og:url: https://daily.dev/posts/lego-machine-plays-tic-tac-toe-without-electronics-lj3tdymbk og:image: https://api.daily.dev/og/posts/lj3tDYMbk.png og:image:alt: LEGO Machine Plays Tic-Tac-Toe Without Electronics og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # LEGO Machine Plays Tic-Tac-Toe Without Electronics **[Hackaday](https://daily.dev/sources/hackaday)** · 2 min read · 0 upvotes · 0 comments ## Summary 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. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [This unbeatable 3D-printed Tic-Tac-Toe computer uses zero electronics to ensure you never win](https://daily.dev/posts/this-unbeatable-3d-printed-tic-tac-toe-computer-uses-zero-electronics-to-ensure-you-never-win-mb6ga4ioe) · XDA Developers · 0 upvotes · 0 comments - [Building A Self-Playing Chess Board Robot](https://daily.dev/posts/building-a-self-playing-chess-board-robot-jbiomg4qr) · Hackaday · 1 upvotes · 0 comments - [Lego Typewriter Writes Plastic Letters](https://daily.dev/posts/lego-typewriter-writes-plastic-letters-kfi1vorm4) · Hackaday · 0 upvotes · 0 comments --- Tags: [#hardware](https://daily.dev/tags/hardware) [View this post on daily.dev](https://daily.dev/posts/lego-machine-plays-tic-tac-toe-without-electronics-lj3tdymbk) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"LEGO Machine Plays Tic-Tac-Toe Without Electronics","url":"https://daily.dev/posts/lego-machine-plays-tic-tac-toe-without-electronics-lj3tdymbk","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/lego-machine-plays-tic-tac-toe-without-electronics-lj3tdymbk"},"datePublished":"2026-03-16T15:45:37.738Z","dateModified":"2026-03-16T15:45:57.400Z","description":"Joost van Velzen built a fully mechanical LEGO machine capable of playing Tic-Tac-Toe without any electronics. 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