600 Snakes on the Edge: How I Built a Slither.io Server with Trail Algorithms, Spatial Hashing & Bot AI

I spent one week building a multiplayer Slither.io clone. The server runs on PartyKit + TypeScript, the client on Phaser 3 + React. Honestly the code is far from perfect — there are hard-coded magic numbers, TODO comments, and parts I would definitely refactor if I had more time — but it works. One