Interesting concept but doesn't seem to quite work on the 500. The SUDOKU screen comes up & the Page buttons do move between the "START", "EASY" & "QUIT" but no button will activate any of these options, at least I couldn't get anything to happen.
In fact the Page back doesn't do anything. I can use the Page forward to toggle through the Start, Easy, & Quit. Or use the joy stick to toggle backward.
BTW, I do have the "Delete File" & the "Clock" hack activated.