Learning to manage a wave of enemies while you're running low on ammo and your teammate just got hit by an electric baton creates some of the best co-op out there.

Where many games have you simply "play at the same time", RE5 requires you to coordinate your actions with your partner in order to succeed. Sometimes it's as simple as doing a "three hit melee partner combo", other times you have your partner's life in your hands as you have to keep a trap from springing, or providing cover fire from afar as they navigate an area.