Cham hacks, Chameleon skins, or chams for short, are a very common form of cheating in online first-person shooters, which generally replace player models with brightly colored skins, often in neon red/yellow and blue/green colors. Chams are wallhacked skins that change color depending on whether the model is visible. For instance, If an enemy's head is showing, it would be a different color from the rest of the model, giving the user a very large advantage over non-cheat users, especially in games in which camouflage on player models is negated by the extremely bright colors or when the cheat user comes to walls which he or she may shoot through.
Battlefield 2 is one of the more popular games to use chamhacks in, as at long distances even non-camouflaged models may be very difficult to see, and stationary camouflaged snipers are nearly invisible, meaning that most players will have difficulty seeing them and returning fire. However, with chams this camouflage is made completely useless, and a stationary sniper actually becomes one of the easiest targets for the cheat user. The only defense against cham users is to take a PunkBuster screenshot of the offender, and look for signs of the cheat.
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