在C:\Program Files\Steam\steamapps\common\left 4 dead\left4dead\cfg內開server.cfg
輸入
//TK
sm_cvar survivor_friendly_fire_factor_expert 0
sm_cvar survivor_burn_factor_expert 0
sm_cvar survivor_friendly_fire_factor_hard 0
sm_cvar survivor_burn_factor_hard 0
sm_cvar survivor_friendly_fire_factor_normal 0
sm_cvar survivor_burn_factor_normal 0
sm_cvar survivor_friendly_fire_factor_easy 0
sm_cvar survivor_burn_factor_easy 0
sm_cvar inferno_friendly_fire_duration 0