PC (Microsoft Windows)September 10, 2010
Released ✓ 
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Halo: Out With a Whimper
Halo: Out With a Whimper was a side-scrolling shooter take on Halo's Firefight PvE mode and served as a gameplay demo of sorts for their previously upcoming game Halo: Olympus, cancelled as of 2013.
ActionScience fictionShooter
Game modes
Single player
Player perspectives
Side view