Demolition Master is a very nice puzzle game for the Mac. As the name suggests, your goal is to demolish structures. You do this by strategically placing dynamite on walls and other structures. Each level is different and the structures get more and more complicated as you progress through the game. It can be played in full screen, or you can play it in a window. There is music, but it can get a little annoying after a while.
When you start the game, you will be asked whether you want to play on Earth or the Moon. If you choose Earth, you will see a world map with nine different locations. At the beginning only Peru and USA are available, and each of those locations houses many different levels. I started the game in Peru, and the first level was a sort of two-story house. I was given three demolition charges to bring the structure to the ground. It tooks me five or six tries to get it right, but I was finally able to complete the level. After you win a level, the next one is unlocked, and so on. After a few levels, the puzzles got more and more complicated, and walls appeared on which you couldn't put demolition charges, which makes the game more complicated.
In short, this game is very entertaining, despite its simple graphics. It can also be very challenging. It is currently free, so I recommend you download it and give it a try.