Any way to make money playing Sudoku (without betting)?

I know there are lots of apps and websites for surveys or playing games, but anyone know about Sudoku specifically? It's my favorite and I already spent hours doing it for free

submitted by /u/umpteenthuproot
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source https://www.reddit.com/r/beermoney/comments/1hk7hr0/any_way_to_make_money_playing_sudoku_without/