Before Angry Birds became so popular that even people who don’t play games wear it on their clothes as a brand, Flash based games that use the laws of physics for its game mechanics are already abundant. Demolition City is one of the more polished (and addictive!) ones.
The mechanics for Demolition City is simple: You are given a structure to demolish and a limited amount of bombs. You place the bombs on strategic points in the structure and press BOOM. You earn money (and progress through levels) based on how much of the structure is left standing.
Play, and share your high scores at Toonbarn’s official forums: