[dave333]

String of free sudoku sites ad supported have been earning $1000+/month steadily since 2005:

https://www.samurai-sudoku.com

https://www.fiendishsudoku.com

https://www.sudokuhints.com

https://www.extremesudoku.info

https://www.easysudoku.org

https://www.sudukopuzzles.org

https://www.sudokuprintables.org

[edanm]

Oooh nice, I started playing a lot of Sudoku sometime during the pandemic after I got addicted to Cracking the Cryptic :)

[eecks]

Where does that $1000+/month come from?

[iSloth]

Likely the ads alongside the games