Super Mario Odyssey will get a free update in February with a new mini-game to play after you've finished the main story.
Luigi's Balloon World sees you hiding or searching for balloons within the game's existing levels, with leaderboards attached so you can see how you match up with others.
When searching for balloons you'll be looking for those hidden by others around the world - so good luck tracking down all the hidden spots you'll likely have missed.
In addition to that, there will be three new outfits - including, amazingly, Mario's shades and shirt from Super Mario Sunshine. A musician suit and suit of armour are also included.
There will be a few new snapshot filters too.
Watch the update in action from around the 6:30 mark above.