If you're planning on unlocking everything in Mario Kart 8 Deluxe, then you're going to need a lot of coins. 10,000 to be exact.
Getting there usually takes a long time, so you're probably tired of waiting. To use this trick, simply do the following:
- On the main menu select Multiplayer 2p.
- Choose VS Race.
- Select any two characters and kart configurations.
- Select the Moo Moo Meadows track.
- Make sure Smart Steering and Auto Acceleration are enabled for both players.
At this point the race will begin and both characters will automatically drive around the track. All you need to do is sit back—or do something else—and let the race finish. Upon completion, just hit Retry and you can keep having the game race itself around the track, unlocking coins for you in the process.