Bonus energy and batarangs
Locate the large red box with a bow on level one. Stand on the right edge of the top of the box. Motorcycles will break of the right side of the box. Jump down and enter the box to receive ten batarangs and extra energy.
Cheat mode
Press Up(8), Down(12), Left(15), Right(19), Option 1(27), A at the title screen when the Batman logo appears. The following cheat functions are now available.