Mario Kart 8 Deluxe is now officially the best-selling Mario Kart game ever. Eat Deluxe 8's dust, Mario Kart Wii.
For the most part, a game's sales will spike when it launches or right after. Its sales will then drop off significantly. There are exceptions to that rule, and most of them are Nintendo games. You only have to check out the UK boxed chart each week for proof of that. Games like Animal Crossing: New Horizons and Super Mario Odyssey are almost always in the top ten, years after
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