The OP asked which games can the processor's onboard graphics play. A lot of posters seem to have missed that.
Unless your definition of 'play' includes slideshows, it's not going to play any major title released in the last couple of years. Games 3-4 years old, probably 30-40 fps at medium settings and sub-HD resolutions. Games older than that it should be mostly okay, just not amazing. Light gaming is all it's really good for.