Enter "TNMN" as a password. Note: This is not armor, although there is a resemblance.

Level passwords

 

Level	Name	Password
2	Bridge	FLLNGDWN
3	Fridge	GTMLK
4	Freezer	CHLLBB
5	Inside Wall	CLSNGN
6	Graveyard	DGTHS
7	Castle	FRNKNSTN
8	Tan Base	BDBZ
9	Revenge	LBBCK
10	Desk	DSKJB
11	Bed	GTSLP
12	Blue Town	SMLLVLL
13	Cashier	CHRGT
14	Train	NTBRT
15	Rockets	RDGLR
16	Pool Table	FSTNLS
17	Pinball Table	WHSWZRD

Invincibility

Pause the game and press Square, Circle, L1, R1.