If you type 'baa baa' when you are playing the game, you can get
weapons, banana bombs, sheep, minigun.
After using the 'baa baa' cheat, select banana bomb or any other
 special and in the process of it being in the air type 'aab 
aab'. Although the cheat will have been taken off you will have
 another go so you retype 'baa baa' and use another banana bomb
 and so on and so forth!

While playing the game select the machine gun, aim, press F1 and
 Spacebar at exactly the same time to shoot. Instead of firing 
bullets you will fire bazookas at an alarming rate.

While playing, aim at the target (don't stand too close). Choose 
uzi. Then press F3 and F5 at the same time and press the 
spacebar to fire something nice.

Select blowtorch or drill from the list. Then while you are 
moving through the dirt press Esc. Wait until your worm has 
stopped moving, and press 'Return to Game.' Your worm will 
automatically start cutting through the dirt again. This process 
can be repeated as many times as you like.