Zombie extermination lessons learned from Left4Dead:
1. Dual 1911s AND the M-16.
2. As many molotovs (or gas cans) as one can find. Zombies are very flammable and flames attract them like moths to a flame.
3. Pipe bombs are noisy and attract hordes of zombies before they go off.
4. Have at least 3 other people armed as you or with the semi-auto shotgun.
None at all. They're just not available in Left4Dead.So whats your problem with chain saws?