Gears of war 3 Game

There's four-player co-op, with a cast of characters that is constantly changing throughout the game. The first player will step out of Marcus' shoes to climb about the Cole Train, while player four may see the game through the eyes of as many as five different characters.
You may not have noticed it on-stage during Microsoft's press conference, but the aiming reticule for your character now becomes more focused when your character is completely still, allowing for more precise shooting when you're not on the run.

Besides playing through in co-op, Epic is still giving incentive to experience online gameplay in the boots of the Gears, as gaining more experience will unlock new melee kills to unleash on your multiplayer prey.