What makes this game truly unique is its gameplay, which is 100% co-op based. Playable over Xbox Live with a friend or solo with the AI, you're always going to be tackling missions with either Rios or Salem at your side, and the developers have created an interesting dynamic between the two characters. Rios is the more experienced and older of the two. He's violent as all hell, but he's not nearly as reckless as his partner, who's the younger hot head. And throughout the course of the game the two banter back and forth and their arguing can ultimately affect the gameplay.