Enter these codes while playing.

Code      Effect
auntem#   warp to level # (1-8)
impumpd   get all the weapons
urdead#   get weapon number #
totlpwr   main energy to 100 percent
maxmeup   hull to 100 percent
imstuck   advances to next mission
steroid   invincible
uragonr   ultimate weapon
frameit   display framerate

In multiplayer mode, press Ctrl-Shift-M while playing to call up a full-screen map.

At the ship select in multiplayer, select Sandtiger, Deathbringer, Deathbringer, Sunfire and Sandtiger. When you're finished the sandtiger will turn into a Trailer!

If you hold down the weapon switch key/button and keep tapping fire (don't hold the button down), all sorts of weapons will spew out instead of one!