Cheat mode
Enter C-Down, Up, C-Up, C-Left, C-Up, Left, C-Down, C-Left or Left, Up, C-Down, C-Left, C-Right, C-Up, C-Left, Down as a password. Alternatively, enter C-Down, Up, C-Up, C-Left, C-Right, Left, C-Left, Up as a password or successfully complete the game with either character on any difficulty level. Wait for the ending credits to complete, then select "Start" from the main menu to access a cheat menu. Options on this cheat menu will allow infinite lives, inventory, continues, play as a monster, and level select.

Level passwords

Level	Password
2	Up, Down, C-Up, C-Down, C-Up, Down, Left, C-Right
4	Up, Left, C-Up, C-Down, C-Up, Left, C-Up, C-Right
5	Up, C-Down, C-Up, Left, C-Up, C-Left, C-Down, Left
9	Up, Right, C-Up, C-Down, C-Up, C-Up, C-Right, C-Right
11	Down, Left, C-Up, Down, C-Up, C-Right, C-Left, Up
13	Down, C-Left, Right, C-Down, Up, C-Down, Down, Up
14	Down, C-Down, C-Right, C-Left, C-Up, C-Up, Left, C-Up
16	Left, C-Left, C-Up, C-Left, C-Up, Down, C-Right, C-Left