Thanks to a fellow CAG member that pointed out that my original links to Halo Zero did not work well with Windows Vista and higher. Below are links to an updated version of the game for Vista and higher OS. Also there is a link to a modding community with an editor and a few mods for players to try out.
Single Player - Yes
Multiplayer - No
Theme: Science Fiction
Halo Zero is a free, fan-made 2D action game based on Bungie and Microsoft Game Studio's Halo franchise. Official Site - http://halo.wikia.com/wiki/Halo_Zero
Megazell's Comment - Update - Here is a link to a modding community with the games level editor and a few mods for you to download - http://hzmods.wordpress.com/. The original developer for this game has abandoned this project. There were some issues with the original file below and Windows Vista and higher OS - Here is a link to an updated version of the game for those using Vista and higher -
OS: Windows 98 SE or higher
CPU: 1 Ghz
Video: 16 Mb
Memory: 256 Mb
Hard Drive: 22 Mb
Download it here - http://download.cnet...4-10474711.html
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Edited by Megazell, 11 September 2012 - 10:49 PM.