Secret Maryo Chronicles is an Open Source two-dimensional platform game with a style designed similar to classic sidescroller games. SMC uses the platform independent library SDL and the OpenGL accelerated Graphics Renderer for the best possible graphics quality.

http://www.secretmaryo.org/

I believe the source files are here, though i may be wrong.

development files http://www.secretmaryo.org/phpBB3/vi....php?f=6&t=300

binaries http://smclone.sourceforge.net/binaries/