 The Hidden and Unknown, developed by ProX and published on Steam, costs 1,999.90 and can be completed in under two hours. The Hidden and Unknown is the most expensive game on Steam, with a whopping price tag of 1,999.90. Its no surprise that the 1,999.90 asking price for The Hidden and Unknown on Steam will ... This Article New Steam Game Costs 2,000 was first Published on World Weekly News... 