Gravity: 
 --------
 Host your own game and make sure your console command window 
 is set as the button ~, press it and a window will come down, 
 type in sv_gravity ***, fill in the *** with as many numbers 
 as you want, the normal gravity is 600 -700. have fun. 
 
 Heavy powered sniper: 
 ---------------------
 Join a game that has a level with a stationary machine 
 game(total war). join the game as a sniper walk up to the 
 gun with your sniper gun out, gain control of the machine 
 gun and just sniper in, your accurracy will be a lot better 
 with this.
 
 Weapon select:
 --------------
 Note: This must be done on the server machine. 
 Type sv_cheats 1 at the console. Change the map 
 with the changelevel  console command. 
 Then, type tf_weapon_ at the console 
 on any machine connected to the server to select 
 that weapon.
 
 Shoot with crowbar:
 -------------------
 Use the following steps to use the crowbar to shoot 
 bullets from the chaingun or flame from a pyro. Change 
 your class to an HW or Pyro. Then, use up all your ammo 
 from your chaingun or flamethrower. After wasting all 
 the ammo, get out the crowbar and hold the Right Mouse 
 Button (or whatever displays your special ability menu) 
 and run over a pack of ammo. You should now be able to 
 shoot with your crowbar.
 
 Dead scout sliding on the ground:
 ---------------------------------
 Change your class to a scout. Go in the console, 
 type  reload, then go underwater in any level. Go 
 in the console and type kill. Wait for someone to get 
 your pack, then you will be a zombie. To respawn again, 
 go in the console and type -reload. Note: This trick has 
 been disabled in the latest versions of the game.
 
 Keep same number of rounds after switching weapons:
 ---------------------------------------------------
 Start a multi-player game and get the heavy weapons 
 character. Have your Gatlin Gun ready and get ready to 
 switch your gun. Have the gun that you want, ready then 
 hold the Left Mouse Button for three seconds. You will 
 hear the gun rotate. The gun you selected will have the 
 same ammo that the other gun. This also gives you an extra 
 192 shots with the shotguns.