Completing certain tasks
You can get special options by completing certain tasks:
Laser Sight Ammo: Beat Mission 4
Jetpack: Beat Mission 8
Fast Walk: Beat Mission 13
Invisiblity: Beat Mission 16
Low Gravity: Beat Mission 20
Industructable Landscapes: Beat Mission 25
Banana Bomb Upgrade: Beat the last mission
Aqua Sheep: Get Gold on The Super Sheep Training
More Powerful Longbow: Get Gold on the Euthanasia Training
Enhanced Shotgun: Get Gold on the Rifle Range
Enhanced Grenade: Get Gold on the Artilery Range
Blood: Get Gold on Basic Training
Sheep Heaven(Which makes all crates Sheeps): Get Gold on Crazy Crates
Industructable Landscapes: Get Elite on Deathmatch
Full Wormage: You need to Complete, all Training, Elite on Death Match, and Complete all Missions.
Cool As Ice level
The ice mission near the start is easier than it looks. Collect as many crates as possible without using any utilities, then use the jet pack to get up to the next section near the guard. Collect all the crates there and stand on the polar bear's head. Point the flame thrower at a spot just to the left of the guard, and fire. You should get through the barrier protecting him, and the flames should send him into the water. Strap on your jetpack and get to the flamethrower. The flamethrower is the most important item on this level. Use it to shoot at your opponents. If it does not immediately kill them, shoot a fire barrel to finish them off.
Home runs
Find an enemy worm standing fairly close to the edge of the level. Use the baseball bat to hit him into the water to get a "home run" complete with baseball bat cracking sound, baseball message (like "It's Outta Here", or "Bases Loaded"), and organ music.
Super Sheep Racing
If you have collected a crate at the very left of the level, and the next crate appears at the very right, deliberately crash or detonate your current sheep and set off a new one. This will save time.
Completing certain tasks...