What platforms is Halo: Out With a Whimper available on?

Halo: Out With a Whimper is available on PC (Microsoft Windows).

Who developed Halo: Out With a Whimper?

Halo: Out With a Whimper was developed by TriBlox.

Halo: Out With a Whimper

About

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.

Storyline

The game is set around the events of Halo 2 and Halo 3 on the human mining colony Atlas as it comes under siege by the Covenant, who are looking for something hidden beneath the planet's surface.