Fatal Fury: Mark of the Wolves Last Blade 2 (did not work) Mars Matrix Marvel vs Capcom 2 Rayman 2 Shenmue Street Fighter III: Double Impact Street Fighter III: Third Strike Tony Hawk’s Pro Skater 2. Oh, and I’m using a US Dreamcast. ...
For the record I still have mine up in my closest and play it from time to time. It was a good system and has been a home brew system with new game releases for a long time. My only issue with the system was the gianormus controller but ...
A walkthrough FAQ for Grandia II on the Dreamcast / PS2. Guide has lots of pictures and starts from the beginning up until Valmar's Tongue and Valmar's Eye in Mirumu.
Depending how skilled the map makers are this could turn out really good. There is even someone working on making "They Hunger" (a Half Life mod with zombies and monsters) playable on the Dreamcast.