Extremely Fast

Extremely Fast is a fun and vivid side-scrolling unity game set on the skyscrapers of 4 metropolis with different levels of difficulty. You start in New York where your mission is to reach the end of the level without being killed by the alien monsters. The game has classic arcade sounds that everyone enjoys. Keep up with your character and meet your objective. Be swift and finish all the levels of this unity arcade game.

Play Extremely Fast right in your Mac OS X Dashboard.
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http://retro.gmer.onemac.net