TEAM FORTRESS CLASSIC

Gravity: 
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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: 
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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.