If you’ve been weighing up whether to spend a small fortune on the iPhone Duo, you’re probably already aware of the software-related criticism surrounding it.

At the time of writing, several high-profile non-Apple apps (including LinkedIn, Google Calendar, and Duolingo) still haven’t been optimized to take advantage of the Duo’s dual-screen form factor (read: they look awful). Still, less has been written about the apps and games that have received a Duo-specific facelift.

I’ve been using the Duo for a few weeks now, and in this guide, I’ve highlighted seven fully optimized (and free) apps whose slick performance bodes well for the future of Apple’s first foldable.

PianoFold is, hands down, my favorite iPhone Duo game so far. It’s basically Guitar Hero, but for the piano — musical tiles glide down from the top of the screen, and you have to tap the appropriate tile as it reaches the bottom of the screen to play the correct melody.

PianoFold works in every iPhone Duo orientation. If you fold it like a laptop, the notes fall from the upright half and strike just below the hinge. If you hold it open flat, the notes strike halfway down the screen. And if you use the Duo closed, the game functions as it would on any single-screen iPhone.

I prefer to play in the unfolded landscape mode, but the half-folded mode looks exceptionally cool if you enable ‘Room view’, which uses the Duo’s camera to make the notes appear as if they’re floating through your surroundings.

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