Nope
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You can't because there isn't an invincibility cheat for halo 3. a matter of the fact, there isn't any cheat codes for halo 3 that i know of. maybe a few
ownitup - Invincibility rockedinface - Unlimited ammunition runforrestrun - Run really fast firepower - All weapons pwnagesince1337 - Double damage for any weapon savemejebus - Slip around everywhere (Low Friction) Like You on ice blud :D
You can get the foam finger gun in Dead Space 2 by beating the game in hardcore mode. You can get it from an unmodded version of the game on any platform (PS3, xbox 360, PC) Here is some proof so people don't remove this thinking I am lying: https://www.google.com/search?q=Dead+Space+2+Foam+finger http://kotaku.com/5746431/beat-dead-space-2-and-it-will-give-you-the-finger http://deadspace.wikia.com/wiki/User_blog:CrackShot/Dead_Space_2_Foam_Finger_Weapon http://deadspace.wikia.com/wiki/File:Dead_Space_2_Foam_Finger_Gun_Easter_Egg You can now also get something similar in Dead Space 3, which is called the devil's horns.
There is a big chance that if you cheat you can get bugs so I'd probably not cheat if i were you and the game is good as it is without using any cheats. -x- http://boards.ign.com/red_dead_redemption/b6186/192143992/p1/?0 this will help. yea.... ):^]
yes if you use cheat engine