Nightmare Creatures [N64]

Cheat mode:
Enter one of the following passwords, then choose the "Start" option to display a cheat menu with unlimited lives, play as monster, and level select options:

C-Down, Up, C-Up, C-Left, C-Up, Left, C-Down, C-Left
C-Down, Up, C-Up, C-Left, C-Right, Left, C-Left, Up
C-Down, Up, Left, Down, Down, C-Left, C-Left, C-Right
Left, Up, C-Down, C-Left, C-Right, C-Up, C-Left, Down
C-Down, Up, C-Up, C-Down, C-Up, Left, C-Up, C-Right.

Nadia's acrobatics:
Begin a new game as Nadia and immediately hold: Up + B + A + C-Left + C-Down. If done correctly, Nadia will jump forward and land in an awkward position and remain that way while moving.

Funny walks:
Begin a new game as Ignatius or Nadia. Stand still during game play, then jump. Hold B while in the air, then walk forward just when his or her feet touch the ground. If done correctly, he or she will walk in a funny manner.

Level Name Password
Nadia
2 Spitalfield Up, Down, C-Up, C-Down, C-Up, Down, Left, C-Right
3 Thames Tunnel Up, C-Down, C-Up, C-Down, C-Up, C-Down, C-Left, C-Right
4 Sewer Snake Up, Left, C-Up, C-Down, C-Up, Left, C-Up, C-Right
5 India Docks Up, Up, C-Up, C-Down, C-Up, Up, Down, C-Right
6 Highgate Cemetery C-Up, Down, C-Up, C-Down, C-Up, Down, Left, C-Right
7 Hampstead Heath Up, Left, C-Up, Up, C-Up, C-Up, C-Up, C-Down
8 Queenhite Docks Up, Right, C-Up, Up, C-Up, C-Right, C-Right, C-Down
9 City Up, Right, C-Up, C-Down, C-Up, C-Up, C-Right, C-Right
10 Smithfield Down, C-Right, C-Right, C-Up, C-Up, Down, C-Left, Up
11 Snowman Down, Left, C-Up, Down, C-Up, C-Right, C-Left, Up
12 Regents Canal C-Right, C-Left, C-Up, C-Down, C-Up, Up, Down, C-Right
13 London Zoo Down, C-Left, Right, C-Down, Up, C-Down, Down, Up
14 Marylebone Down, C-Down, C-Right C-Left C-Up, C-Up, Left, C-Up
15 Bloomsbury Down, Left, C-Up, Left, Up, Up, Left, Left
16 Pimlico Left, C-Left, C-Up, C-Left, C-Up, Down, C-Right, C-Left
17 Jose Manuel Left, C-Up, C-Up, C-Down, C-Up, C-Down, C-Left, C-Right
18 Westminster I Left, C-Right, C-Up, C-Down, C-Up, C-Left, Up, C-Right
19 Westminster II Left, C-Down, C-Up, C-Down, C-Up, Up, Down, C-Right
20 The Roofs Left, C-Left C-Up, C-Left C-Up, Down, C-Right C-Left

Ignatius
2 Spitalfield C-Up, C-Right, C-Up, C-Down, C-Up, C-Right, C-Down, C-Right
3 Thames Tunnel C-Up, C-Down, C-Up, Left, C-Up, Up, C-Left, C-Left
4 Sewer Snake C-Up, C-Left, C-Up, Up, C-Up, Up, Up, C-Down
5 India Docks C-Up, Up, C-Up, C-Down, C-Up, Up, Down, Right
6 Highgate Cemetery C-Up, Left, C-Up, Up, C-Up, C-Up, C-Up, C-Down
7 Hampstead Heath Up, Left, C-Up, C-Down, C-Up, Left, C-Up, C-Right
8 Queenhite Docks C-Right, C-Up, C-Up, Up, C-Right, C-Down, C-Left, C-Left
9 City C-Right, C-Right, C-Up, C-Down, C-Up, C-Down, C-Left, C-Right
10 Smithfield C-Right, C-Down, C-Up, C-Down, C-Up, C-Left, Up, C-Right
11 Snowman C-Right, C-Left, C-Up, C-Down, C-Up, Up, Down, C-Right
12 Regents Canal C-Right, C-Left C-Up, C-Down, C-Up, Up, Down, C-Left
13 London Zoo C-Down, C-Right, Right, Up, C-Down, C-Right, C-Up, Left
14 Marylebone Unknown
15 Bloomsbury Unknown
16 Pimlico Unknown
17 Jose Manuel Unknown
18 Westminster I C-Down, C-Right C-Up, C-Down, C-Up, C-Left Up, C-Right
19 Westminster II Unknown
20 The Roofs C-Down, Up, C-Up, C-Down, C-Up, Left, C-Up, C-Right

Ultimate Password
Enter this at the input password screen enter:
Left, Up, Up-C, Left-C, Down, Left, Left-C, Up