(Note: I have had three number one games on the App Store previously).

'I personally get a great feeling knowing that millions of people have played my games. 'I've done mainly premium experiences since I started on the App Store but have dabbled with free versions, and price drops,' Matt Hall, one third of the developer Hipster Whale, told Polygon. Or you can pay actual money for the characters. Or you can skip the ads and just use the stock character. You can find coins to buy chances at unlocking other characters, and you can also earn coins by watching ads. Things become very competitive, very quickly. The further you get, the higher your score and of course you can share your score on social media.

If you move too slowly a bird grabs you and eats you, so you must always be moving forward. It's an 'endless Frogger,' where you swipe up, left, right or down to move your character and avoid cars, trains and drowning.

The game has been stuck in my mind like a thorn ever since I downloaded a pre-release version a few days ago. Download Crossy Road if you have an iOS device.

Free crossy road