The "Perpetual Testing Initiative" has been expanded to allow you to design co-op puzzles for you and your friends!
Developer: Valve
Publisher: Valve
Release Date: 17/04/2011
Price(USD): $9.99
Minimum Requirements:
- Processor: 3.0 GHz P4, Dual Core 2.0 (or higher) or AMD64X2 (or higher)
- Memory: 2 GB RAM
- Graphics: Video card must be 128 MB or more and with support for Pixel Shader 2.0b (ATI Radeon X800 or higher / NVIDIA GeForce 7600 or higher / Intel HD Graphics 2000 or higher).
- DirectX: Version 9.0c
- Storage: 8 GB available space
- Sound Card: DirectX 9.0c compatible
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