At first in Demolition City 4, you will only receive one type of dynamite and you will have to do your best to destroy a few simple buildings. You can place the explosive by clicking on the part of the building you want to destroy first. Each level comes with only a few dynamite sticks, so you have to use them wisely. The goal of the game is to destroy the building so that it doesn't exceed the maximum allowed height after it falls down. If one part of the structure is above this limit, you will have to try again. The best strategy is to cause a chain reaction and make the building fall inwards. Each new building will be larger and stronger, but you can also upgrade your explosives along the way. In some of the more advanced levels of Demolition City 4, you will not only have bring the building down, you will also have to be careful not to destroy some of the buildings which are close to your main target. This means that you have to come up with a good strategy and figure out how to make the building fall on the right side.
Demolition City 4 is not your average explosion game; you have to think before you act and see if you can bring down each building in the proper way, without destroying the ones which aren't part of your plan.