Bought Sonic Adventure 2 for the Dreamcast. 10 euro, a bargain.
Thing is the disc is scratched. It doesn't seem all that bad, but one of the scratches may be deep enough to freeze the game at random loadings.
Sometimes it doesn't even get passed the SEGA screen. The system identifies the disc as legit, starts it up, then backs off to the menu.
I've tried toothpaste, shoe wax, eyeglass cleaner... Am now looking for some store with those disc polishing machines.