It’s possible to play games on Intel HD Graphics, maybe some low-end games and platformers. You can run some Source games. Portal could work (Dunno about Portal 2 though). Half Life 1 and Half Life 2 should work. It would be amazing if Spore would work on your PC.
Yes, i can play NFS Underground 2, HL1, HL2, Call of Duty 2, Crossfire, CS2d, BF2, Simpsons Hit & Run, Warface (sometimes crashes), Codename CURE, Portal I have not tested it yet.