Snarf the weapon of your choice with these codes. To use 'em, just pause the game and press the keys below.

Weapon Code

Plasma Gun C, C, C, C, A, A, A, B
3 Shot Gun C, C, C, C, A, A, A, C
Homing Gun C, C, C, C, A, A, B, A
Bubble Gun C, C, C, C, A, A, B, B
Nuke Gun C, C, C, C, A, A, B, C
Teleport Mucus Bomb C, A, B, C, A, B, Up, Down