More inventory items:
Each time a weapon is upgraded, the items in the inventory will increase by five.

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:

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

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.

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
6	Highgate Cemetery	C-Up, Down, C-Up, C-Down, C-Up, Down, Left, C-Right
9	City	Up, Right, C-Up, C-Down, C-Up, C-Up, C-Right C-Right
11	Snowman	Down, Left, C-Up, Down, C-Up, C-Right C-Left U
14	Marylebone	Down, C-Down, C-Right C-Left C-Up, C-Up, Left, C-Up,
16	Pimlico	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
5	India Docks	C-Up, Up, C-Up, C-Down, C-Up, Up, Down, Right
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
18	Westminster I	C-Down, C-Right C-Up, C-Down, C-Up, C-Left Up, C-Right
20	The Roofs	C-Down, Up, C-Up, C-Down, C-Up, Left, C-Up, C-Right