The scoring formula should be written as percentage completed without errors * (difficulty level + remaining score) which yields a maximum score of 112,000 if you could somehow complete the puzzle in 0 seconds. I have gotten in the mid 80,000s but that seems to be my limit. To get 100,000 exactly, you would have to complete the expert puzzle in 2 minutes. That would give a time bonus of 600 (720-120) so you would get 100*(400+600) which is 100,000. It is possible to "cheat" at Daily Sudoku by completing the puzzle correctly in Chrome's Incognito mode without logging into the AARP website, then making note of all of the numbers. You can then exit out of Chrome, come back in, log into AARP and then redo the same puzzle and quickly re-enter all the correct numbers. To me, that is cheating but I'm sure some people do it. The normal Sudoku puzzle gives you a new puzzle every time so this cheating method won't work for that.