This is the multiplayer game mode in Gears 2 where you have to survive wave after wave of enemies.  I reached level 18 in a public match (without dying) in normal difficulty.  The only reason we lost is because three guys quit.  Then I managed level 30 in a private match with two other guys.  Level 30 is fucking hard.  I don't give a shit about the other modes, this is where it's at.

So who has Gears2?  We need to set up a match sometime.  Don't forget to download the free flashback maps.