Grand Theft Auto (GBC) was pretty glitchy. Location arrows would steer you towards the wrong area (or wouldn't even show up at all), cars and/or people would be missing (which meant that certain missions couldn't be progressed), and sometimes you'd be left with nothing to do. Add to the fact that even though the game was compatible with the original Game Boy, it ran about 10x slower on the GB, making it unplayable.