TETR.IO

A free‑to‑play online Tetris‑style game that lets players compete in real‑time matches against friends or strangers worldwide. The platform includes solo and multiplayer modes, a ranking system, and leaderboards that track high scores and seasonal performance. It runs as a desktop client on macOS and is maintained as a stable release.

The service provides tools such as performance tips, patch notes, and an API for community support, while also offering a set of legal and community guidelines. Players can customize their experience with optional visual themes and in‑game items.

Development is led by a core team that handles programming, graphics, audio, and networking, supported by a broader community of moderators and contributors who manage moderation, design, and ongoing updates. The project is open source in part and acknowledges various external contributors.