#3 Borderlands 2
https://youtube.com/watch?v=Mglr9JHoHLw
Gearbox placed all their love and care in the development of Borderlands 2, and it shows in every single aspect of the game. Its host of characters, guns, and locations are designed for cooperative gameplay.
Although players can go through the game alone, it’s better to go with a friend (or three, as the game supports up to four players) as it cuts down on downtime quite a bit—players can heal each other in combat and raise downed allies. In addition, the game’s quite a bit more challenging because the difficulty of the enemies scales up (or down) depending on how many players are in the game.
Beyond that, the game offers a “True Vault Hunter Mode” for advanced players to further level up their characters and earn even better weapons to use in battle, and there’s nothing cooler than showing off your gear to the friends you play with.