Here's a cheat for the demo-version of Tekwar: press the [Pause] key (this could be another key depending on your keyboard; I'm also told that this doesn't work under Win 95!). You'll now see the word HOLY on top of your screen. This gives you god mode. The following commandline-parameters should work with both the demo- and the commercial version:
NOENEMIES - You're lonely in the city
NOGUARD - No guards in the game
NOCHASE - No shooting enemies in the game
NOSTROLL - No innocent bystanders in the game


The following cheats only work in the full commercial version of Tekwar:

[ALT][SHIFT][G] - God mode
[ALT][SHIFT][W] - All weapons

To access the cheats simply type in the code during gameplay.
TRIFIR0 Temporary Invincibility.
TRIFIR1 Reloads PAC.
TRIFIR2 Reloads ION.
TRIFIR3 Reloads RTL.
TRIFIR4 Reloads MAM.
TRIFIR5 Reloads SAD.
TRIFIR6 Reloads SWT.
TRIFIR7 Reloads DAM.
TRIFIR8 Recharges afterburner fuel.
TRIFIR9 Invisibility.
TRIFIR10 Full Invincibility.
TRIGODS God mode plus weapons powerup.
TRINEXT Jumps to the next level.
TRISHLD Restores shields to full strength.
TRSCOPE Oscilloscope.
TRIHOVR Combat hovering.
TRFRAME Frames-per-second.
TRIWARP# Warps to level number you type in at #.
TRIBURN Super afterburner booster.
3DREALM Weapon power-ups.

Activate the cheat mode by hitting ALT and # together (on U.S.keyboards, type its ALT and \ then enter code word and press return).
BANDAID-Restores power and armor points
FIREPOWER-Gain all weapons
GARBLE-See the cheat codes you're typing
ICANTSEE-Viewscreen
NEXTMISSION-Warp to next mission
SUPERUZI-Get Super Uzi with 9999 ammo
TURBO-Turbo mode
WHOAMI-Displays location

levellla-unlocks all the levels
miktrout-big cars
mpalmer-small cars
spazzy acid mode
sraclla-unlocks all the cars
bobcred- during the gameplay, the car won't jump anymore.

Enter your name and Callsign and press <Ctrl+Enter.

You'll fly trough the training missions. When you want to cheat
just press 'PLOP' with your RIGHT shift key.

The rockets can't trace you anymore, and when you crash you will be
sent to the following mission.

Last Code: (Rhombus)

First click on an icon in the corner . A fax machine will pop up with a question on it. Look down at the bottom and there are some numbers and then the green button. Enter 24328 and the following cheats will work. Or enter7287 to go to a rat shotting level after you have completed the level you are on.
i found this one on how to get all the rooms and litter bombs.:Ctrl+shift+C
These I found in a magazine:
Shift+C toget more money
Ctrl+y end of the year
Ctrl+m end of the month
Ctrl +C full reasearch
Use a hex editor to open your Theme Hospital saved game and you can change your money.
Go to offset 61A95, and change it to FFFFFF-Gives you a ton of money.

Type in HORZA as nick name in Theme Park. When the cheat activates, use the c or z keys in conjunction with Alt, Ctrl or Shift to get various things.
Type DEMO as your nickname, choose continue game and you play as a SUPERPARK.

Dirty Tricks and bugs:
The computer fighters don't know you're attacking them if you don't have them targeted, so it is easy to destroy them if you turn off your targeting computer. That way you can easily blow them away with unlocked missiles or lasers.
Enemy capital ship guns don't know if they are shooting at their allies. So, you can pull their fire over to your other enemies, dodge the fire, and have them blow away their own allies, including containers etc.

side step right,side step left,side step left, take 1 step forward,1 step back, turn around 3 times, then jump forward with a twist. When u do this lara croft will explode.
Light a flare, take 1 step forward, 1 step back
turn around 3 times. Finally jump forward to skip level or jump back to get all the guns fully loaded with bullets
Level Skip: Ignite a flare,then step forward,step backward,turn around three times,jump forward.

Code: - Effect:
+ATM - Gives you 1000 metal and energy.
+CDSTART - Starts CD Music.
+CONTOUR# - Displays a 3D contour, # = 1-15.
+CONTROL# - Lets you to control a different skirmish AI.
+DITHER - Dithering instead of line of sight.
+DOUBLESHOT - All weapons do twice the damage.
+HALFSHOT - All weapons do half the damage.
+ILOSE - Causes you to lose.
+IWIN - Causes you to win.
+NOENERGY - Drops your energy to 0.
+NOMETAL - Drops your metal to 0.
+NOSHAKE - Stops explosion screen shakes.
+NOWISEE - Full map and disables line of sight.
+RADAR - 100% radar coverage.
+SING - This command makes units "sing" when given orders.
+SWITCHALT - Allows you to switch between squads with alt+# keys.
+VIEW# - Lets you see how much metal and energy a player has.
Below is the first Campaign cheat code:
Click on Total Annihilation's Single Player icon. When the Single Player Game page appears type DRDEATH (it is not case sensitive). This will cause a Cavedog Entertainment bone to appear between the Load Game and Previous Menu icons on the right side of the screen. Clicking on the bone will take players to a special Play Any Game screen where they can play any Total Annihilation mission, even if they have not earned their way to that level yet.

hold down SHIFT and CTRL and type CHEAT
Now press:
CTRL and C :- for 1000 credits a time
CTRL and N :-To choose a new mission

TO GET SECRET FIELDS- SET UP EXHIBITION GAME AND GO TO STADIUM SELECT, THEN PRESS UP, DOWN, RIGHT, UP, DOWN, LEFT, UP AND YOU WILL GET THE CORNFIELD.ANOTHER FIELD IS RIGHT, LEFT, UP, LEFT, DOWN. RIGHT, LEFT THIS GETS THE MYSTERY FIELD.
TO GET AN AUTOMATIC HOMER AT BAT PRESS AND HOLD 1,2,AND 7 THEN MAKE CONTACT.THIS ALSO WORKS WITH A BUNT.

1212 ctrl - EA dream team
1212 ctrl 21 - three new stadiums, corn field, polo grounds and mystery

On map screen:
bgshow-----shows animals
bgtrack----quick move, stealth mode
bgurine----attracts game
bgvampire--shows blood trails
On main menu:
bgbullwinkle---only moose
bgelabong------only elk
bghorns--------only sheep
bgyogi---------only bear
bgsteroids-----only trophy-sized game
bgnoah---------increase number of animals
When weapon is raised:
bgweather-----changes weather
bgpredator----infrared vision
bgsniper------stops gun from moving
bgbarbecue----becomes a rocket launcher(this has never worked for me, but it may for someone else)

BE SWEETTOOTH
ON CAR SELECT MENU TYPE IN GLORIOUSICECREAM AND YOU SHOULD HEAR A SOUND, FLIP THREW THE CARS AND YOU SHOULD FIND HIM.