Four new challenge maps filled with hordes of undead enemies and devious traps you must maneuver and exploit to survive.系统需求OS: Windows 7 / Vista / XP
Processor: 3+ GHz Intel or 2.5+ GHZ AMD
Memory: 1 GB RAM (XP) / 2 GB RAM (Vista)
Graphics: NVIDIA GeForce 6 Series (6800GT or better) / ATI 1300XT or better
Hard Drive: 7GB
Sound: DirectX 9.0c compatible sound card and drivers
*2024 年 1 月 1 日（PT）起，Steam 客户端将仅支持 Windows 10 及更新版本。
