So...
whats started here
http://gamebuino.com/forum/viewtopic.php?f=13&t=3384 is now on Github
https://github.com/scmar/B-RallyScreenshot:
Playing is pretty simple: race as fast as you can
You need to reach at least 3rd place to unlock next track.
Install: Put B-RALLY.INF, B-RALLY.DAT and B-RALLY.HEX on your SD-Card and choose B-Rally at the Loader...
Many Thanks to clement for testing and very useful tips.
Superfreaky an frakasss for suggestions on name and deeph for hints with sprites