Free sidescroller software for linux

SuperTux project is a classic 2D jumpn run sidescroller game in a style similar to the original SuperMario games. The Milestone1 release of SuperTux features 9 enemies, 26 playable levels, software and OpenGL rendering modes, configurable joystick and keyboard input, new music and completly redone graphics.
Together with a little story, we hope to provide a good gaming experince with this first Milestone release.
The improvments in Milestone1 are in huge part the result of the work done surrounding the Game of the Month March 2004 event on happypenguin.org.
The Milestone1 section of this webpage was mainly used to coordinate development and to post sketches and other things. It will give you an overview of the development of the features and enemies that have gone in Milestone1, it might be a bit outdated and is mainly present for historic reasons to those interested in the development.
Enhancements:
- new, OpenGL- and OpenAL-based engine
- final boss for Icy Island
- brand new Forest World with new badguys and new game objects
- new and improved soundtrack, immersive sound effects
- much more...