- Who
- Luigi's Mansion 3
- What
- 9,590,000 unit(s) sold
- Where
- Not Applicable ()
- When
The best-selling videogame staring Mario's brother, Luigi, is Luigi's Mansion 3 released on 31 October 2019 for the Nintendo Switch. As of 31 March 2021, Luigi's Mansion 3 had sold 9.59 million units worldwide.