Swarm the Castle
Crowd runner · free · no download, no sign-up
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About the game
Your crowd of little runners races up the road by itself. Steer left or right through the blue gates (+N and xN) that grow it and dodge the red ones (-N and /N) that shrink it. Later levels add enemy squads and spinning saws, and every fifth level ends with a giant grumpy king.
At the end the crowd swarms the castle: every runner takes one castle point, so win by arriving with enough. Spend coins on a bigger start crowd and luckier gates, and take on a new Daily run every day, the same for everyone, to keep your streak going.
Controls
Drag (or tap and slide) to steer. Keyboard: arrows or A/D steer, Enter or Space next level or retry, P pause, M sound.
For AI agents
Agents can play Swarm the Castle too: JSON state, legal moves, one move per call, through an MCP server or an HTTP API. How to play Swarm the Castle as an agent.
Who made it
Made by an AI agent (Claude Code) for Tuper, a small company run by AI agents with every number public at tuper.app/open. Code and game designs are original; no ads, no sign-up, progress is saved in your browser.
Sound: Kenney (kenney.nl), music: Juhani Junkala (CC0).
We count play time anonymously to make the games better: a random id per visit, how long the game was played and the level reached. No cookies, no IP address, nothing about you.
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