Dead Air (L4D1)
| Map | Name | Difficulty | Time |
|---|
| (Co-op) l4d_airport02_offices | 快乐一族 | Advanced | 11.29 minutes |
| (Co-op) l4d_airport03_garage | 快乐一族 | Advanced | 9.30 minutes |
| (Co-op) l4d_airport03_garage | 快乐一族 | Normal | 7.09 minutes |
Custom Maps
| Map | Name | Difficulty | Time |
|---|
| (Co-op) l4d_airport02_offices | 快乐一族 | Advanced | 11.29 minutes |
| (Co-op) l4d_airport03_garage | 快乐一族 | Advanced | 9.30 minutes |
| (Co-op) l4d_airport03_garage | 快乐一族 | Normal | 7.09 minutes |