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I couldn't give Ph3n70m another +, so I'm leaving this comment. His Maze tip will get you the badge, no hassle. Giggity's tip left my computer frozen (and would take forever) klimtom's tip required more skill than I was willing to exert.
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I hope I'm not the only person who is having trouble playing multiplayer, for some reason it says 'Paused!' when I start the game, please can someone tell me the solution if you ever have it to.
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I'm sure I'm not the only one who built complex traps and explosive mazes for the zombies to navigate, before blowing them all up.
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How to win the achievement
Play on Normal, do not turn off anything, play cooperative with cousin, plant lots of mines, place lot of barrels, get killed by those barrels a couple of times, substitute barrels for walls, give them hell!!!!
Get tired of placing walls, fight like a man! and die spectacularly
Not as easy. But damn! its alot of fun and when you win the achievement. You earned it.
DavidTano.