1. The board games are Gokuraku Viper Lanjerie (insert colour here) and Gokuraku Viper Paradice (sic, Para
dice as in dice in a board game, get it?), "Gokuraku" means "paradise" if that helps you remember that little sub-series name. Probably not. The Islands games are entirely different, they have different types of minigames but no board games (well, "Sugoroku Punk" comes close, I guess.)
2. I've never even read anything about GRR. M3 3.5 is pretty rare, but there are some animations on the board if you look hard enough. M5 is a little less rare than M3, I think I have an anim for it saved I can post in a bit.
Edit:
Here it is! Tsubasa with a face full of Saori's pussy.
3. No, that's Mina, huge difference.
4. In your registry. Open up regedit.exe from your windows folder and do a search for Sogna.