When you use the UZI, when you are just about to fire, quickly keep pressing F1. This will turn your uzi into a BAZOOKA LAUNCHER, at least i think its F1, ( anyway whichever one it is )

Alternate weapons:

Type "bobjob" at the weapons screen to turn cluster bombs to banana bombs and mines into
exploding sheep.

Mole bombs:

Type "ff ff ff ff" at the weapons screen

Level Codes:

01: VERYEASY
02: OHSOEASY
03: UNCHAINS
04: BJORNPOP
05: DODGEMAX
06: STARTURN
07: HEYGEOFF
08: REZDOGGY
09: HIGHKICK
10: LONG AGO
11: HEY JOHN
12: SATANICS
13: NEARDEAD
14: SCUMBAGZ
15: GOOD BYE
16: TRUTHOUT
17: 17THKIND
18: GOGOGOGO
19: PIGSPACE
20: TRUMPTON
21: PARANOID
22: MIXTURES
23: VERY MAD
24: INSANITY
25: GREATGIG