Minimalist tunnel racer Boost 2 is free to download from the App Store for a limited time.

Launched back in 2009, Boost 2 was an early AppSpy favourite. Heck, we awarded it a 5/5 back when it was still known as Boost 3D.

A few years, and several major updates later, Boost 2 features additional game modes, online multiplayer, support for Retina displays, and Game Center achievements and leaderboards.

It's better than ever, in other words. And it was pretty great to begin with.

Boost 2 is available to download now, and it won't cost you a penny. You'd better boost your way over to the App Store, though, as this is strictly a limited-time offer.