Grand Theft Auto Advance

Get a six star wanted level. When you see a tank drive by, take it and drive it to your hideout. Save your game and when you reload, you will have no wanted level and a tank.

Press A + B to shoot. The tank rounds have a homing ability and will follow the nearest car/pedestrian. Also, the smaller and weaker cars will explode when you run them over

Press Left, Right, Up, Down, L, R, then hold Start and press A at the main menu. A level select option will now appear.