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This games I remember testing on co-op :)
apache vs havoc
comanche vs hokum
Descent 1 and 2
Descent 3
Freespace 2
Sacred Gold
Post edited June 05, 2009 by Skreczi
Kyllingen: Yipes, I didn't realise ( or maybe I've forgotten ) that Freespace 2 has co-op. Now I definately need to get my brothers to buy a copy so we can purge the universe of evil-doers and good-doers alike

But i forget to mention that co-op in Freespace 2 is only in missions not campaign. Still some missions are connected or there is a series of missions in co-op multi Freespace 2.
Sacred Gold
I forget - Obscure of course! Its the only survival horror with cooperation mode. But watch out! Its very console like coop - one player is using game pad or right side of the keyboard and second one is using left side of the keyboard (or game pad :P ) So its kind of not multi coop.
Post edited June 05, 2009 by Skreczi
We are glad that GOG could help ;)