originally posted in:Halo Forum
Halo: Opposing Force
You Play as the arbiter character throughout halo 1, 2 and 3's campaigns. the halo 2 segments will be HD updates of the levels as they appeared in halo 2.
or
Halo: Green shift
Like the above but with sgt johnson
English
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That sounds like the Half-Life add on games... With Opposing Force and Blue Shift.