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Historically Unique Concept? Check!
Addictive, Basic Game-Play? Check!
Presence of a Community? Check!
Note #1: Do not install this game through Desura. Doing so will result in installation errors. Download at the main web-site.
Note #2: If you are receiving an "Invalid Steam UserID Ticket Error", close steam, navigate to your Steam directory and delete everything except your Steam.exe file and your steamapps directory. Restart Steam, it should be fixed.