COSMOS 404 is a free online 3D space runner game where you sprint across procedurally generated tiny planets in a colorful low-poly galaxy. Each planet is randomly built, so no two runs ever feel the same. Your goal is simple: keep running, stay alive, and rack up as many coins as possible before hostile aliens take you down.

The gameplay loop is fast and satisfying. Coins are scattered across each planet's curved surface, and grabbing a Magnet power-up pulls them all toward you automatically, making collection runs feel incredibly rewarding. The Speed Boost kicks your movement into overdrive, letting you outrun alien threats and chain planets together faster. Timing your jumps between planets is the real skill here — mistimed leaps send you drifting into space and end your run instantly. The further you push, the more chaotic and densely packed the obstacles become.

COSMOS 404 is perfect for fans of hypercasual arcade games, endless runners, and casual 3D space games you can pick up for a quick session. It scratches the same itch as other free online running games but adds a satisfying planetary gravity twist that keeps it fresh. Whether you're searching for free space games no download, casual arcade games online, or low-poly 3D browser games, this one delivers short, addictive runs that always make you want to beat your previous distance.