The co-op mode is a splinter off the single player. You and a buddy launch your teams on the field and take turns just like you would in the campaign against hordes of monsters. The new feature in Co-Op play is the ubiquitous RPG feature: Summons. During your buddy's turn, you can tap the screen to power up a Summon for your turn to blast the baddies to bits. No doubt this concession was made after playing a few games with a friend who spent three minutes pondering each move, silently musing to themselves at their own craftiness. 

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