Mario Kart Tour has been available for one week, and 90 million people have installed it. For Nintendo mobile games, nothing else even comes close. It's been quite a launch week.

Downloads don't necessarily equal active users or revenue, though. I downloaded Mario Kart Tour, for instance, and I only played it long enough to realize that its controls are inferior to every other Mario Kart game. I have no intention of ever playing it again. I'm sure a few of those 90 million are like me--they just wanted to check out the new Nintendo release. When they see it plays like a mobile game, they give it up. I mean, mobility is what the Switch is for, right? Why not just take Mario Kart 8 with you, then? It's way better.

And that's the rub with mobile games. Sure, a lot of people can download the game--but will they keep playing it? Will they spend money on it? Will Nintendo have another Pokémon Go on their hands? I'm not so sure, but 90 million is still a whole lot of people. Anything could happen, I suppose.

By the way, Pokémon Go isn't on the above chart because Nintendo only owns a 32% share of the Pokémon Company. Nevertheless, despite Pokémon Go's huge release, it was only about a third as big as Mario Kart Tour. 38.5 million people installed it in the first week. It has grown exponentially since then, of course, and it has also been successfully monetized. Pokémon Go brought in $110 million last month and $2.95 billion since its release.

Mario Kart Tour has only generated $6 million in revenue so far, so it's got a lot of ground to make up in that regard.

In the meantime, though, it's a free download on the App Store and the Play Store. You'll just need a Nintendo Account to play.