Dead Air
| Map | Name | Difficulty | Time |
|---|---|---|---|
| (Co-op) l4d_airport02_offices |  Theorizing | Normal | 6.82 minutes |
| (Co-op) l4d_airport03_garage | Theorizing | Normal | 6.94 minutes |
| (Co-op) l4d_airport04_terminal | Theorizing | Normal | 3.63 minutes |
| (Co-op) l4d_airport05_runway | Theorizing | Normal | 6.40 minutes |
