Gears Of War cheat codes:
Successfully complete Campaign mode on the Casual or
Hardcore difficulty setting to unlock Insane difficulty setting.
Easy group kills:
Once you get the Torque Bow, wait until you see groups of Locusts,
then shoot one in the head. After you wait a few seconds, it should
blow up and kill all or most of them.
Two player path block :
Use the following trick while playing in two player mode and you
reach a difficult part with a doorway. Have one player die in the doorway.
This will create a block that the Locust cannot get past. They will usually
line up behind your dead partner, allowing you a safe zone to easily
pick them off. Once it is clear, just revive your partner and move on.