Dr Mario World, which releases later this week, perfectly sums up Nintendo’s compromised adventure in smartphone gaming. It’s a supremely polished, easy-to-enjoy game that meets the Kyoto company’s famously high quality bar. It takes one of Nintendo’s classic games – a block-matching puzzler that dates back to a 1990 Nintendo Entertainment System original – and reworks it for touchscreens with imagination and care. And for its business model, it resignedly copies what everyone else does, at a cost to the design and balance of the game that has been minimised, but is still there.