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. 

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

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

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

Nuclear Bomb:
To unlock the Nuclear Bomb, complete all ten deathmatch challenges. If it does not 
work with all bronzes, try to get silvers and golds.

Super Sheep:
To unlock the Super Sheep, complete all Super Sheep challenges with a "Gold 
medal" rank.

Bridge Kit
In the Beefcake Breakfast, get the crate located on a rooftop. 

Giant Island: marijuana 
Tiny Island: smashsumfruit 
Frozen Map: Bigape (set theme to arctic theme) 
Blimp Map: bangbang (set theme to war) 
Cliff Map: igotworms (set theme to England)