Dead Air
| Map | Name | Difficulty | Time |
|---|---|---|---|
| (Co-op) l4d_airport02_offices |  Professor Cake | Normal | 7.42 minutes |
| (Co-op) l4d_airport03_garage | Professor Cake | Normal | 6.16 minutes |
| (Co-op) l4d_airport04_terminal | Professor Cake | Normal | 6.56 minutes |
| (Co-op) l4d_airport05_runway | Professor Cake | Normal | 6.49 minutes |
