This concept was originally made by iHc James than superman and smile ported it to mw3 and FanGirl leaked it and i thats how i got it than edited it and put it as a option in the pause menu. Its a very smart concept and is something only iHc James would come up with, cause he is awesome

You need to be able to mod, other than that you just download the file and replace the code_post_gfx_mp.ff in trucha signer

When you first get to multiplayer go to options/mods/lobby and select lobby. Than go online and start searching for a FFA but before you find a match exit and go to a private match. Than set the gamemode to FFA and start. The match will end than go into to a public. If you want to host the real thing stay in public until you find a match and when your host it will work and you should commit suicide to get lvl 80. If you want to go to a private exit out and go into a private but the xp will not stick.