Demolitions Master

Demolitions Master is a "guerrilla act" in Red Faction: Guerrilla.

Description
Demolitions Master is a timed challenge pitting you and your sledgehammer against an EDF barrack. You need to knock the entire building down in less than three minutes, but you can also do these continually and try to beat your best time in each subsequent attempt. As you knock down the building, you'll see all the ingredients that go into making it. Bits of rebar stick out of the crumbled cement, metal mesh protrudes from the wall, and support beams in the roof fall down independently of the other roof materials.