Open Syobon Action
A browser port of Syobon Action
A web browser port of Open Syobon Action (also known as Cat Mario), compiled using Emscripten.
Play opens jezng.com in a new tab. Link checked 4 Nov 2026.
- Developer
- jezng
- Tech
- Emscripten
- Genres
- Action, Platformer
- Added
- 3 Nov 2026
Open Syobon Action is a web browser port of the notorious platformer game often known as Cat Mario. Ported by @jezng using Emscripten, this version brings the challenging fan-made platformer directly to modern web browsers.
What you need
Nothing to install or upload.
Good to know
The original source code is available on SourceForge.
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