The very best games mix together an effortless class and a compulsion loop that keeps you playing until your eyes are sore, your fingers are chafed, and you can't remember the last time you saw any sun other than a digital one. And that's why Alto's Odyssey ranks among the very finest experiences you can get on the App Store.
More than that though, the game is a brilliant example of how to do a sequel. It doesn't slavishly adhere to the formula of its predecessor, but it doesn't stray too far from what made Alto's Adventure great either. It's a balancing act of the very best kind. And it's also a whole heap of fun.