Turbo Kartz

Turbo Kartz is a cartoon kart racer that plays in a browser with one to four players. You can race solo against three bots or share a split screen with two to four people, pick from a roster of chunky cartoon characters, and drive four tracks: Sunny Meadow, Candy Canyon, Snowy Peaks and Beach Bay. Each track has its own road shape, colours and ramps, and the ramps are placed on the straightest sections so jumps are a reward rather than a random hazard. Press any button in the air for a trick and you land with a one-second boost.

The accessibility options are unusually thorough for a browser racer. EASY mode keeps you in your lane and steers away from the edge when you let go, MANUAL gives you full control, and KIDS mode drives itself so younger players can watch and steer occasionally. The game supports gamepads (Xbox, PlayStation, Switch Pro), TV remotes, keyboard and touch, and the developer tested it on a Sony BRAVIA Android TV as well as Mac and Windows browsers. Two players can share one keyboard, or each use their own controller, with split-screen layouts for up to four.

The build log is refreshingly honest about what broke. The road was initially invisible on the TV because the flat ribbon faced down and was culled, which made the track look like a green field and sent everyone into the walls. Split screen failed because the first gamepad became player one, the same player as the remote. A sleeping Switch Pro Controller came back with a new device ID and exhausted the player slots. Each bug is documented with the fix, and the EASY-mode steering was validated with a simple test: twenty seconds of gas with no steering produced zero wall touches in EASY and seven in MANUAL.

Turbo Kartz was built in Claude Code. Claude Sonnet 5.5 generated the game in 12 prompts, and Claude Opus 5.5 added the TV and split-screen work in 8 more, according to the developer’s build log. Music came from Lyria 3 Pro, and the track-select art was generated with Codex from screenshots of the game. The result is a rare thing: a local-multiplayer kart racer that loads from a URL, supports real gamepads and a TV remote, and feels like a living-room game rather than a demo. If you have a spare controller and a friend, start with EASY and a short track.