CHN is working on a new game for the Dreamcast, heres a screen and his latest WIP news:
The little "pet" project I'm working on every now and then is "ZhongWen". This is a puzzle game which, when finished, will be released for the PC and the Sega Dreamcast, but I'd go as far as to say that it should be portable to any platform with some kind of OpenGL support.
The graphics are naturally not that advanced since I'm not that much of a designer, really. But you should get the game mechanics idea.
There are several extras, you can create chain reactions. There can be more that one path in one level, and each path is defined as a bezier curve.