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| Rating_os | 4.5 |
| Rating_num | 5280542 |
| Author | Valve |
| Author url | https://store.steampowered.com/developer/valve?snr=1_5_9__2000 |
| Requirements | Windows® 7/Vista/XP, MacOS X 10.11 (El Capitan) or later, Ubuntu 12.04 |
| Release date | Aug 21, 2012 |
