Iv'e been running PRS+ on my new prs650 for a week now & it's great. Everything appears to work ok but sudoku. I know someone has mentioned it in this thread before. Is it just me or the only thing I can get to function on sudoku is quit? Anybody else have sudoku working on the 650? The chess is a cool feature too (It works for starters), Although some higher levels would be nice. the current level is too easy to beat & I cirtainly don't claim to be very good at chess.