Gosu is a 2D game development library for Ruby and C++.

It is available for macOS, Windows, Linux, and iOS.

Gosu is focused, lightweight, and has few dependencies (mostly SDL 2). It provides:

• a window and a main loop
• 2D graphics and text, powered by OpenGL or OpenGL ES
• sounds and music
• keyboard, mouse, and gamepad input

Gosu is mostly used to teach or learn Ruby or in short game development competitions.

Two games built with Ruby/Gosu have been published on Steam: Super Bombinhas and Bloopy & Droopy.

Resources

In addition to the documentation linked from the sidebar, there are a few videos about Gosu on YouTube.

Licensing

Gosu and all documentation © 2001-2026 Julian Raschke, Jan Lücker, and other contributors. Gosu is released under the MIT licence.