Musical twin-stick shooter Beat Hazard Ultra is currently available to download for free from the App Store.

This pyrotechnic shooter is driven by your own music library, and allows you to blast bad guys to the beat of your favourite MP3s.

The frantic high score arcade gameplay comes straight from the PC version of Beat Hazard, but the game has found a natural home on music-filled iPhones since its App Store debut last month.

We were wowed by Beat Hazard Ultra's aural and visual spectacle - so much so that we awarded the game a 5/5 in our review.

Shooter fans and music lovers alike will want to grab Beat Hazard Ultra at this low, low, low, low, low price point while they can, for this is strictly a limited-time offer. The game usually retails for $1.99.