It is with classical game.
The rules are very simple: you can only destroy 3 or more items.
Damage can be done on horizontals, verticals and even at an angle.
If you are destroying more than 3 elements, then for each element is given an extra second.
When you reach level 4 – you will have only 15 seconds.
When you reach 5 – you’ll have only 10 seconds.
Definitely a game you want to spend hours playing.