The hammer is a one hit death melee weapon, but has a three second interval in between hits making it the slowest weapon in the game. You run very slowly with it.
thumb|300px|right|A video showing the sledgehammer by "movieboy 187"
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 cool-down before you can attack. So, properly strategy is needed. Often, camping is a good idea with this weapon (it is actually the best camper).