Worms 3D Cheats

The easter egg should be in a crate on the very edge of the building to
the left of the church.  Finish the mission and you should receive info
on That Angular Chap.

Successfully complete Beef Cake Breakfast Brawl with a "Gold" rank.

Unlock the following by doing the corresponding tasks
Banana Bomb:
Complete Shotgun Challenge 3.
Bridge Kit:
Get the crate located on a rooftop in the Beefcake Breakfast.
Earthquake Weapon:
Complete Jetpack Challenge 3.
Mad Cows:
Get 3 Golds and complete Shotgun Challenge.
Nuclear Bomb:
Get 10 Golds and complete Deathmatch Challenge 10.
Super Sheep:
Complete Sheep Challenge 3

To unlock more levels, you must complete missions in Campaigne mode. When you complete a level with a gold (and rarely, a silver) you will usually unlock the level you just played in. Your trophy rank depends on how fast you complete the mission. You will know you unlocked it during the cutscene at the end of the level, the worm will unlock a box with a lock on it, and get mamed somehow by the box.

Pass Test Tube training to unlock the Pro Weapon Scheme.
Get gold on To Boldly Go to unlock the Sinking Big Weapon Scheme.
Get gold on Hook, Line and Skimmer to unlock the Sniper Weapon Scheme.
Get gold on Hold Until Relieved to unlock the All Action Weapon Scheme.
Get gold on Beef Cake Breakfast Brawl to unlock the Sticky Wars Weapon Scheme.