Promotions:
Enter Nauty pigs as a case-sensitive name.

Extra promotions:
Successfully complete the game one time, then start a new game to have 250 promotions available.

Team Lard and level select:
Enter MARDY PIGS as a name.

View FMV sequences:
Enter PRYING PIGS as a name.

Bonus FMV sequence:
Enter WATTA PORK as a name.

Getting promotion points:
You can get Promotion Points (PP) by doing the following.

Completing a level: 1 PP
Keeping all of your pigs alive in a level: 1 PP
Completing all the levels on a island: 5 PP
Completing special tasks on some levels: 1 to 5 PP

Easy kill:
This trick only works if you have Freeze Gas and Hide. First throw Freeze Gas on your opponent(s); then Hide for as many rounds as necessary for the opponent(s) to sneeze themselves to death. Even the strongest opponent (legend) can be defeated in this way. However, this may take up to (150-15)/10 i.e. 14 rounds; weaker opponents are finished off sooner. The advantage of this method is that even if you are outnumbered and/or very weak you can still kill really strong opponents while guaranteed that you get away unharmed.

Use a weapon that can knock Pigs far, such as the Cattle Prod. Knock them far out into the water and they will lose a lot of health trying to swim back to land, and they may even drown. This is also useful if the water is Poison -- even if they make it back to land they will be poisoned. Note: Commandos and Heroes will not lose health in the water.

Use the following trick to ensure a hit with a missile launcher. Get close (but not too close) to the enemy. Level the sight of you bazooka so it is straight. Aim at the enemy, then apply full power. This will definitely do 40 damage to him.

Easy level completion in multi-player mode:
Choose multi-player mode and set it for two players and one CPU player. Choose a level then pick the team you want. Next, select the player you want to help you then the player you want to play against. You can control the first and second player. It will now be easier to defeat your enemy because you will have twice as many hogs as the them. When you defeat the enemy, have player two skip a turn. Have player two keep skipping turns until you kill all of player two's hogs to win.

Destroying vehicles, pillboxes or artillery:
When you are attempting to destroy vehicles, pillboxes or artillery, an excellent way to do so is to have a pig with a flamethrower (Pyrotechnics have them, level 3 heavy weapons soldiers, or they can be used in multiplayer mode). Walk it up close to the intended target. Face the target, and let rip with the flamethrower, so all the flames hit the vehicle, pillbox or artillery. It should suffer about 102 to 108 points of damage.

Attack with jetpack:
If you have jetpacks that you do not need, walk up to an enemy and turn around so you are facing directly away from your target. Equip a jetpack, and aim directly upwards. Fire the jetpack, and then release it after about two seconds. The enemy will suffer a maximum of 20 points of damage from the blast caused by the jetpack hitting the earth, plus any additional damage caused according to where the pig lands. Your pig should land safely by parachute, but try and make him land on an enemy. If you can do so, you will inflict 1 point of damage. You can repeat this as many times as needed one turn, providing you have enough jetpacks and do not suffer damage yourself -- using a jetpack does not end a turn.

Heal yourself:
Heal yourself with a medi gun by pointing the gun straight up in the air. Shoot, and it will hit and heal you.

Get Commandos before the level 1:
Start a new game and enable the "Bonus FMV sequence" code. Play the training mission and after the loading screen two FMV sequences will start. The game will then return to the starting screen or the men upgrade screen, depending on your version. Select multi-player mode, and choose a deathmatch. Then, select the Play Pen level and choose paratroopers for your entire team. Start the game, and you will see the FMV sequences again. After they complete, you should have Commandos at the men upgrade screen.

Swimming:
Commandos and Heroes are the only ones that can swim without losing health. All other Pigs will lose health trying to swim.