Cute Fish With Knives is a free-to-play, real-time multiplayer browser game built entirely from scratch by Gubby Labs. Players explore a hand-crafted pixel-art world, catch fish, awaken those fish into combat allies, battle enemies, complete branching quest lines, craft consumables, and interact with a living world that cycles through day, night, and seasons -- all in the browser, with zero downloads required. Every system described in this document was designed, architected, and implemented by our team.