This was an Amazon Appstore Giveaway.
iDemolished is is a game where you are given certain amount of explosives, and you need to bring a building down so the debris is no higher than a certain specified height. The less money you use, and the lower the final height is, the higher is your score.
There is a lot of physics involved, as they have different types of material, some of which are only vulnerable to bigger explosives.
For true demolition effect, you can adjust the timing in 0.1 second intervals, as you want the building to collapse, usually by blowing up one side of it.
You can also influence the "gravity" a little bit by tilting the phone to one side.
There's like 100 levels for you to test your demolition skills on, and there are additional levels to download, and there's even an editor if you want to get really cute.
Definitely worth your time, even paid.