All Action Weapon scheme - Successfully complete Hold Until Relieved with a "Gold" rank.
Banana Bomb - Successfully complete all three shotgun challenges with any rank to unlock the Banana Bomb.
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 - Successfully complete all three jetpack challenges with any rank to unlock the Earthquake Weapon.
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 "7873155" (North American version) for an England-based map with a lot of bridges.
Mad Cows - Successfully complete all three shotgun challenges with a "Gold medal" rank to unlock the Mad Cows.
Nuclear Bomb - Successfully complete all ten deathmatch challenges to unlock the Nuclear Bomb. If it does not work with all bronzes, try to get silvers and 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 - Successfully complete all Super Sheep challenges with a "Gold medal" rank to unlock the Super Sheep.
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.
Voice option - On the campaign level where you have to fix the computer monitor, make some room for yourself by killing the enemies, or you can do the code as it is, although you are very likely to get killed. 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.