A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
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I got this when it was on steam sale. Really fun, especially early on (5-10hrs in). I found that the stealth approach was much more thrilling but...
My opinion is that the more unlike the game is to others, the more you must show to generate interest in it. This is why a lot of crowd funding...