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Kept it simple, works well with 3 buttons on cursor-up / -down :)

I had a "clear" button - easy enough - just the "real estate" is a bit tight. Anyway, the tab and arrow keys might need some investigation to work out an efficient method - with 81 "FILL-IN" fields I don't want to have a stack of triggers - good problem to contemplate! And exactly why I did...

oh, please suggest improvements!

took the excel solution from Sudoku Solver and translated to Openedge. Openedge does not have multi dimmentional arrays so it requires some "fiddles". Also note the variable "tom" in the Excel vba is an uninitialised variable so it equates to zero, also note, dodgy variable scoping eg...