Co-Optimus - Review - Gears of War 4 Co-Op Review

With an engaging campaign, smart Horde mode additions, and a cast of characters that go beyond being the stereotypical "meatheads,"

Which Gears of War has 4 player co-op campaign?

Optimus Prime

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Co-Optimus - Review - Gears of War 4 Co-Op Review

Gears of War 4 Scales Back Co-Op, Story Takes Place Over 24-Hour Period - GameSpot

Review: Transformers: Fall of Cybertron

You can now play Supreme Commander 2 in co-op with up to four players