When playing, stay still until Beethoven scratches himself, then press Up, Down, Up, Down, A, A, Up, Down, Down, B. Then choose the level using Left and Right, then press B. However, the levels are not in order. The order is 00 = Level 3. 01 = Level 5. 02 = Level 4. 03 = Level 2. 04 = Level 1. 05 = Level 6. 06 = Ending.