Apple on Thursday updated its App of the Week promotion with the game Colossatron: Massive World Threat. For the next 7 days, you can pick up the destructive strategy game for free on both iPhone and iPad, a solid savings of $1.

From the App Store Editors’ Notes:

Colossatron is developer Halfbrick’s creative spin on a match-three game. Amid frenetic, explosive battlegrounds, attach colorful weaponry to a roving monstrosity and enhance its destructive power. The easy-to-understand gameplay and cleverly designed matching and upgrade mechanics reward careful, strategic play. With quirky humor and thoughtful attention to detail, Colossatron is an expertly crafted and accessible delight.

And here’s a clip of the game in action:

Colossatron: Massive World Threat is available in the App Store for free (with some IAPs).