Power Strike

There are six rounds to complete (three in the mobile version). In each round, numbers (from 1 to 8) can be found on the ground either enclosed by a ring, or in the air carried by a ship. Getting these numbers will upgrade your firepower. Get more of the same number for a maximum upgrade. Unfortunately, whatever the type of firepower you get, you will have a limited supply of ammo, so you need to stock up on the same type of firepower if you get too low.

At the end of each round, there is an end-of-round boss which involves shooting parts of its base in order to destroy it. Intermediate bosses can be found in the last three rounds (console version only).