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Even though it inherited the title from the original Tron, Space Paranoids is very aptly named. Because your advantage lies in speed, not firepower, the game encourages a lot of running away and waiting for enemies to come to you. Space Paranoids is not just a good advergame or a nice taste of nostalgia; It's also a fine game in its own right, and a great example of what the Unity engine can do when done well.
W,A,S,D / Arrow Keys - Move.
Spacebar - Center tank.
Mouse - Aim / Shoot.