Level generator codes: 

Enter 257462320 or 194915571 for a very small map that only contains a little bit 
ground and a tiny bridge.

Enter 1585104494 for a very high altitude map. 
Enter 241780260 Worms3D for a very long map. 
Enter 221350867 for a map with four consecutive submarines. 

Teleporting:
In levels where there are objects floating in the air, if you teleport onto them 
sideways, there is a chance that you will actually teleport inside the object. This is 
especially true for the green air ships. 

Level generator:
Not only can you type in numbers to generate levels, but you can also type in 
words and it will convert it for you. 

Unlock Banana Bomb:
Complete all three shotgun challenges with any rank. 

Unlock Earthquake Weapon:
Complete all three jetpack challenges with any rank. 

Unlock Mad Cows:
Complete all three shotgun challenges with a "Gold medal" rank.

Unlock Nuclear Bomb:
Complete all ten deathmatch challenges. 
If it does not work with all bronzes, try to get silvers and golds.

Unlock Super Sheep:
Complete all Super Sheep challenges with a "Gold medal" rank.