Nightmare Creatures

There are three methodes to unlock the cheat menu, which contain the
unlimited lives, continues, play as a monster, inventory and stage
selection options.

Enable cheat menu #1:
Enter the following button combinations as a password:
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

Enable cheat menu #2:
Enter the following button combinations as a password:
C-Down, Up, C-Up, C-Left, C-Right, Left, C-Left, Up

Enable cheat menu #3:
Play on any difficulty level and finish the entire the game with either
character. Watch the complete ending credits, after choose "Start" option
from the main menu.

Level passwords
Press the following button combinations to jump to the indicated level.
-
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
-