Left 4 Dead 2 has native Xbox 360 controller support. The default mapping is already close to the console version, but you can fine-tune it.
| Action | Button |
|---|---|
| Move | Left Stick |
| Look / Aim | Right Stick |
| Fire / Primary Attack | Right Trigger (RT) |
| Melee / Shove | Left Bumper (LB) or A |
| Reload | X |
| Use / Interact / Revive | A |
| Jump | A (tap) / Left Stick Click (LS) |
| Crouch | B |
| Switch Weapon | Y |
| Throwables (Pipe, Molotov, Bile) | Right Bumper (RB) |
| Health Item (Pills/Adrenaline/Kit) | D-Pad Up / Left D-Pad |
| Voice Commands / Ping | D-Pad Left/Right/Down |
| Pause / Menu | Start |
| Scoreboard / Voice Chat | Back |
Once set, your config saves to Steam Cloud — works on any PC you log into.