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Nintendo

shares have rallied 18% so far this week after a Pokémon game became a surprise viral hit, raising hopes it could drive sales of the company’s flagship Switch 2 console.

Nintendo sold 2.2 million units of “Pokémon Pokopia” in the first four days after its release last week, making it the fourth-best-selling title so far for the Switch 2, which was launched last year.

First announced in September last year, the game wasn’t seen as a potentially huge blockbuster, as it is a spin-off from the main Pokémon franchise.