If you are playing a Multiplayer Skirmish, build up about 10-20 artillery. Take them into the enemy base(s), deploy them, and reek havoc on the enemy base. If the enemy is Nod and they have a Stealth Generator, Bring in a Mobile Sensor Array along with the artillery.
NOTE: With this code you ae messing with the programming of the game. You might screw the whole thing up if you're not careful.
To get better resolution find the folder that TIBERIAN SUN is in, double click on the folder and find a file called SUN.ini, open it and go down to where it says [Video]. In that you should see somthing like this:
ScreenWidth=
ScreenHeight=
StretchMovies=
go to ScreenWidth= and change the number to: 1024 then go to ScreenHeight= and change the number to: 768, finally go to StretchMovies= and enter: no
This will only work if the max resolution on your monitor is 1024 x 768 or higher.
If you want to make any units or buildings better you can adjust the settings in the Tibsun.mix file, but save or copy the original either as another name or in a file so if anything goes wrong you can reload it. Settings can be found for all parts of this game.
If you have a Mutant Hijacker, you can steal civilian vehicles. Listed below is the amount of infrantry each one can carry.
Take a harvester and fill it with blue tiberium, then put it in your enemy's base. I usually put it beside a building and then when they destroy it, it will blow up the building.
Send a group of D.T's and place them just out of the range of a laser/component tower and line them up with the defense structure. Force fire in front of the structure and the disks will bounce into the structure. Even though its not as accurate, the laser/tower won't shoot you. You can use this in many situations to increase the attack range of your Disk Throwers.
Tell a Disc thrower to force fire someplace. Then when he is about to throw tell him to fire across the map and he Will. Those Arms must really be good.
When playing as GDI, you can build structures that can be upgraded, ie. power plants. If a structure that can be upgraded is damaged and you build the add-on for that structure, ie. power turbine, the structure will be fully repaired. The only money that you will lose is the money that you spent on the upgrade.
If you have a firestorm wall and it is fully charged, you can make it last forever without having to turn it off to charge. First charge your wall fully, then turn it on. Before it turns off or runs out of power sell or turn off your power plants until the words "On Hold" appear in the firestorm Icon. Your wall will stay on forever and will not run out of power until you build or turn on your power plants.
NOTE: This does not work if you install the latest patch ver. 1.11!