Shares in Japanese games maker Nintendo soared more than 50% after it released Pokémon Go, an augmented reality game that has caught the imagination of millions worldwide. Players walk to locations in the real world in search of virtual Pokemon creatures shown on their smartphone screens. There have been reports of players becoming so engrossed in the game that they bump into things and fall over.

Nintendo’s buoyant shares have lifted the company’s market value above that, for example, of Barclays Bank.