Successfully complete Hold Until Relieved with a "Gold" rank.
Banana Bomb
Complete Shotgun Challenge 3.
Bridge Kit
In the Beefcake Breakfast, get the crate located on a rooftop.
Deathmatch challenge 1
Successfully complete the D-Day campaign.
Deathmatch challenge 10
Successfully complete Deathmatch challenge 9.
Deathmatch challenge 2
Successfully complete Deathmatch challenge 1.
Deathmatch challenge 3
Successfully complete Deathmatch challenge 2.
Deathmatch challenge 4
Successfully complete Deathmatch challenge 3.
Deathmatch challenge 5
Successfully complete Deathmatch challenge 4.
Deathmatch challenge 6
Successfully complete Deathmatch challenge 5.
Deathmatch challenge 7
Successfully complete Deathmatch challenge 6.
Deathmatch challenge 8
Successfully complete Deathmatch challenge 7.
Deathmatch challenge 9
Successfully complete Deathmatch challenge 8.
Earthquake Weapon
Complete Jetpack Challenge 3.
Jet Pack challenge 1
Successfully complete the Rum Deal campaign.
Jet Pack challenge 2
Successfully complete the In Space, No-One Can Hear You Clean campaign.
Jet Pack challenge 3
Successfully complete the Hold Until Relieved campaign.
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.
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.
Mad Cows
Complete Shotgun Challenge 3 with all golds.
Nuclear Bomb
Complete Deathmatch Challenge 10 with all golds.
Parachute challenge 1
Successfully complete the Falling For You campaign.
Parachute challenge 2
Successfully complete the Worm and the Beanstalk campaign.
Parachute challenge 3
Successfully complete the Costa Del Danger campaign.
Pro Weapon scheme
Successfully complete Test Tube Training.
Sinking Big Weapon scheme
Successfully complete To Boldly Go with a "Gold" rank.
Sniper Weapon scheme
Successfully complete Hook, Line And Skimmer with a "Gold" rank.
Sticky Wars Weapon scheme
Successfully complete Beef Cake Breakfast Brawl with a "Gold" rank.
Super Sheep
Complete Sheep Challenge 3.
Super Sheep challenge 1
Successfully complete the High Stakes campaign.
Super Sheep challenge 2
Successfully complete the Plaice Holder campaign.
Super Sheep challenge 3
Successfully complete the A Good Nights Sheep campaign.
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.
Various Codes
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)
Voice option
On campaign level where you have to fix computer monitor, get yourself some room to breathe by killing the enemies, or do the code as it is, although you are very likely to get blown up. Jump on the keys on the keyboard and spell "TEAM17" (no spaces). You will get a message at the top of the screen stating that you unlocked a hidden Easter Egg. The secret is a new voice option for teams.
Play the Nobody Rides For Free mission, where you need to collect the three boxes of land mines. Play for awhile and a fourth box will appear where you started the level. When you collect it, you will get a message that you have found an Easter Egg. The voice that you unlocked is called "Grandpa".
In the Grave Danger mission (where you must blow open the graves with grenades), behind one of the houses is a very small circle-shaped grave. There is steam or smoke coming out of the grave, just like the big ones. Drop a grenade on top of the grave, jump down into the grave, and you will get a message that you have found an Easter Egg. The voice that you unlocked is called "Horror".