Monday's Good Deed: Play Crossword/Sudoku Puzzle and Donate to Charity?

I love playing sudoku. I love it even more when I can play sudoku and donate to charity. Unfortunately, I haven't found a site that offers the best of both worlds (playing sudoku and donate to charity FREE). Same for crossword puzzle (even though I suck in playing it). It may be a good idea for you out there to start a website like this. If I overlook any website that meets my expectation here, please contact me.