Go through 12 missions, earn scores to obtain new technologies, destroy all rivals with deadly weapons.
Lots of different enemy types extend pure "match-3" gameplay into complicated puzzle.
In each mission, you must destroy all enemies within a given amount of time. You need to match 3 or more enemies by exchanging two of them.
In some cases, it's possible only with weapons.
You can unlock weapons by earning the scores.
In first missions the game is pure "match-3".
Later the game becomes an unusual puzzle, in which, in order to win, you must use your weapons correctly.