G.I. Combat might realistically model the chaos and confusion of a real-world skirmish, but it's hardly playable.
Galidor: Defenders of the Outer Dimension
This game lets players assume the role of Nick Bluetooth, who must free his friends from the evil Gorm.
Grand Theft Auto: Vice City
Grand Theft Auto: Vice City provides just about everything you'd want in a follow-up to an outstanding game.
Gladiators of Rome
If you can get past its problems, you may find Gladiators of Rome to be a quirky strategy game that's interesting to play--at least for a little while.
Geoff Crammond's Grand Prix 4
It might not be the hands-down best Formula 1 game currently available, but it's certainly a solid racing game that's deserving of your attention.