Cube 2: Sauerbraten

Cube 2: Sauerbraten is a free first‑person shooter that supports both multiplayer and single‑player modes. It continues the legacy of the original Cube FPS, focusing on fast‑paced deathmatch gameplay while allowing players to edit maps and geometry directly within the game environment. The engine is built from scratch, released under the ZLIB license, and its source code is openly available for modification or integration.

The software targets gamers who enjoy classic arena shooters and developers who want a permissive, open‑source engine for creating custom levels or experimenting with real‑time map editing. Community resources such as the Quadropolis site, competitive SauerDuels league, and the Sauerworld blog provide maps, news, and forums for collaboration.

Cube 2: Sauerbraten runs on macOS, Windows, and Linux, with stable releases offered for each platform. Its design emphasizes in‑game cooperative editing and a straightforward, source‑available codebase, distinguishing it from other shooters that rely on proprietary engines.