red alert 3 co-op

@plokite95

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@Hardcore038

What plokite said.  The official servers have been offline for years, but there are replacements provided by the community:

• For the classics (Command & Conquer 1, Red Alert 1, Tiberian Sun, Red Alert 2) you can use CnCNet.
• For the later games (Generals, C&C3, RA3) you can use C&C: Online.