It is with classical game. The rules are very simple: you can only destroy 3 or more items. Destroy can 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. Thank you friends :)
Note: When you reach level 4 – you will have only 15 seconds. When you reach 5 – you’ll have only 10 seconds.