The news that Nintendo and mobile partner DeNA are currently working on a smartphone Mario Kart came out of the blue, even if it's not all that surprising given Nintendo's current smartphone strategy of using its biggest brands.

Details on Mario Kart Tour are thin on the ground, but we now have a little more information thanks to the ever-reliable  of The Wall Street Journal.

Again, this isn't tremendously surprising as Nintendo has adopted the "free to start" or "free to play" approach with its other smartphone titles. The only slight exception to this was Super Mario Run, which offered a limited free version but required players to invest cash if they wanted to unlock the entire experience.

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