What’s next for Unity, one of the world’s most widely used game making tools

When Monument Valley shot to the top of Apple’s App Store in April, it was something of a coup.

The game, made by an eight-person development team at Ustwo in the UK, had grabbed the app world’s attention with its M.C. Escher-inspired puzzles The company’s $3.99 app defied convention, first by charging cash instead of offering an initially free download, and then by gaining attention so quickly where most successes climb the stores rankings slowly.