7. Warframe
A co-op focused free to play for up to four players, Warframe offers meaty progression and a tonne of awesome missions for you and a group of buddies to tackle. The main draw is in its deep and varied upgrades system, with player progression and weapon mod slots keeping each Warframe hugely unique to its respective player. Though it's only in beta at the moment, it's shaping up very nicely indeed.
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