The listing, Poly Bridge [Steam Key] has ended.
Unleash your engineering creativity with an engaging and fresh bridge-building simulator with all the bells and whistles.
Enjoy hours of physics-based puzzle solving in the Campaign and then jump in the Sandbox to create your own bridge designs and puzzles.
Challenge friends and the rest of the Steam Workshop community to solve your puzzles and download more levels submitted by other players.
More info: http://store.steampowered.com/app/367450/Poly_Bridge/
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This game works on mac and linux too! Also includes steam trading cards
Good Luck!