The hammer is a one hit death melee weapon, but has a three second interval in between hits making it thethumb|300px|right|A video showing the sledgehammer by "movieboy 187" slowest weapon in the game. You run very slowly with it.
The sledgehammer is the most powerful weapon in the game so take advantage of this and be wary of it's greatest weakness: speed. After you attack, there is the three second cooldown before you can attack. So, properly stragety is needed. Often, camping is a good idea with this weapon (it is actually the best camper).