At the beginning of each stage, set a bomb and keep on pressing the same button and you'll be a walking a bomb; however, this will end until you stop flashing. You can also start it again by getting the "vest" item.
Stage 1:
PART 1: 5555
PART 2: 7503
PART 3: 5543
PART 4: 0513
PART 5: 5522
PART 6: 7564
PART 7: 3535
Stage 2:
PART 1: 0055
PART 2: 4005
PART 3: 0043
PART 4: 5012
PART 5: 7024
PART 6: 5064
PART 7: 0034
Stage 3
PART 1: 5453
PART 2: 7402
PART 3: 3444
PART 4: 0412
PART 5: 2423
PART 6: 0464
PART 7: 4434
Stage 4
PART 1: 6154
PART 2: 4103
PART 3: 7144
PART 4: 5114
PART 5: 1122
PART 6: 4164
PART 7: 0135
Stage 5
PART 1: 5252
PART 2: 7204
PART 3: 5244
PART 4: 6213
PART 5: 4224
PART 6: 1264
PART 7: 3232
Stage 6
PART 1: 0652
PART 2: 3605
PART 3: 7645
PART 4: 5615
PART 5: 7623
PART 6: 4665
PART 7: 1635
Shrink
At the password code screen enter the password "5656".
Six bombs, six flames, and the detonator
Enter 1111 as a password.
Sound Test
Plug in the Multitap and a controller for player 5. When the title screen appears press and hold R on that controller. A sound test option will appear.