Hold R on controller two while powering on the SNES.
Release the button at the title screen and begin a new game at
the normal skill level. Pause game play and enter one of the following
Press R, Up, B, A.
Press B, Up B, A.
Full map and all keys
Press A(2), Up, B.
Press Up, B, R, B.
Hold R on while powering on the SNES. Continue to hold
the button until B.J. appears, then quickly press Up +
Select. The level selection screen will appear. Select
"S6" to start game play at the secret level.