Cheat mode: 
Enter the console (retail versions require CS to be started with "-console" command line
parameter) on the server machine and enter "sv_cheats 1". You can change maps by typing
"changelevel dust" (or any other map name). Now enter one of the following codes at the
console:

CODE                               EFFECT           

give weapon_awp               Arctic sniper rifle (see below for other weapon spawns)    
sv_gravity <-999 - 999999>    Adjust gravity            
impulse101                    $16,000 dollars
sv_clinettrace 9999           Hit an enemy even it he/she is not in the center of the crosshair but is still on your screen.
"+forward; model arctic       Artic terrorist skin
autoteambalance 0             Turn auto-balance off
autoteambalance 1             Turn auto-balance on
mousesensitivity 0.1          Very slowest w/ low sensitivity
mousesensitivity 9.9          The fastest w/ high sensitivity




This cheat takes effect on CS Beta 6.6 (LAN games). Bring down the console, and type these
cheats:

gl_alphamin 1 : removes ladders, nets or fences...
de_aztec : removes net on bridge
cs_militia : removes fence at CT base.) 
sv_aim: adjust_crosshair(change the color of the crosshair) 



All Cheats must be entered from the host computer or server.

Adjust Gravity:
During gameplay access your console (default key is the ~ button). Now enter sv_gravity and
a number between (-999 and 999999)

Auto-Reload:
Hit the ~ (by default). Enter: +reload. This codes works, but it’s slightly annoying. After every
shot you will reload. If you get sick of it, enter this code: -reload. This will disable
auto-reload.

Faster Movement:
Hit the ~ (by default) to access the game console.

Fast Forward: 
cl_forwardspeed (enter # between 0 and 999)

Fast Backward:
cl_backwardspeed (enter # between 0 and 999)

Fast Strafe:
cl_sidespeed (enter # between 0 and 999)

Level Select:
Hit the ~ (by default). Enter: Changelevel (map name)

Set the C4 Timer:
This code must also be entered from the Host Computer. Hit the ~ (by default). Enter:
Mp_c4timer (enter a # between –1000 and 1000) –1000 will be a very short timer, and
1000 is a long timer. Got it?



Weapons

Give weapon_awp
Give weapon_ak47
Give weapon_tmp
Give weapon_mp5navy
Give weapon_p90
Give weapon_xm1014
Give weapon_m3
Give weapon_scout
Give weapon_m4a1
Give weapon_sg551
Give weapon_g3sg1
Give weapon_m249
Give weapon_assaultsuit
Give weapon_c4
Give weapon_deagle
Give weapon_usp
Give weapon_p228
Give weapon_glock18


Bind Costumes:
ENTER:
BIND W "+FORWARD;ADJUST_CROSSHAIR;MODEL SAS"
BIND A "+MOVELEFT;MODEL 1337"
BIND D "+MOVERIGHT;MODEL GIG-N"
BIND S "+BACK;MODEL ARCTIC"
BIND UPNARROW "+FORWARD;MODEL VIP"
BIND RIGHTARROW "+MOVERIGHT;MODEL SCIENTIST"
BIND LEFTARROW "+MOVELEFT;MODEL GORILA"
BIND DOWNARROW "+BACK;MODEL SAS"



Hints

Replenish:
On maps like "Dust" or "Aztec" where heavy fighting takes place somewhat near to the "T's"
start point, T's can purchase items like ammo, kevlar, weapons etc. If you find that you need
to replenish any of these items, just go back to the "Buy" point and re-purchase these items.
Taken a few hits? Go back buy some more kevlar.