Go to the save game option, when the game requests a name type: "JOOLS" (it may be "JOOLSA"). Cheat mode active will flash at the bottom of the screen and the ranks and abilities of your men will have increased. Note that some of these hints also (or only) apply to Cannon Fodder 2.

1. In Choppas, land on the enemy to kill them, safer than landing and then getting out.
2. In missions in which you have control of a lot of troopers, separate the lowest ranking trooper from the rest and give him all the weapons. Ensure the rest are safe, then attempt the mission with one trooper. If the trooper dies just press 'Esc'. This saves a lot of troopers later, such as in mission 18 phase 5 of 5 - The Door.
3. Troopers are able to throw grenades quite a long way and over walls, trees, and buildings. Use this to your advantage to protect against Biggunz and Jeeps. To throw a grenade a long way, simply position the pointer further than needed.
4. Buildings can be destroyed even if you can't see them. For instance, if a trooper is in Biggun and there is a building slightly off the edge of the screen, roughly aim at the building making sure the pointer is at the very edge of the screen and fire.
5. Learn to control Jeeps and Skidooz early on (how to skid them). In later levels, particularly the "Franz Clammer's Revenge" mission, you may need good control to hit ramps at the correct angles. Otherwise you can blow up if you hit walls. This is also useful to get away from shells, rockets, and grenades.
6. An effective way of destroying snipers is to just run straight towards them and shoot you guns. Don't waste grenades on them unless it is necessary.
7. Let the turrets blow each other up when you are low on ammunition (e.g. in phase one of mission sevens, where you must destroy guns after blowing up their buildings.
8. When being attacked by a helicopter, run around in a circle until it lands. Then blow it up with a rocket launcher.
9. On mission 18, you can find a four star general icon under the second gun turret to the right.
10. In the first part of mission 21, you will be able to kill lots of enemies by collecting the armored car in the bottom right of the complex. Destroy all vehicles and all enemy buildings except for the main building in the complex center. Park your armored car outside of this building and leave it there. The enemies will find it and blow themselves up with hand grenades trying to destroy it. Depending on how long you're content to let them do this, you can amass a huge number of points for your soldier.
11. The final level is the easiest. All you have to do is have your firing squad execute the enemy leader.