Hi there I'm trying to see if I can solve 16*16 grid Sudoku problems. Does anyone know if its more efficient to use advanced Hodoku techniques or simply with basic rules to cross reference forced chains from 2 cells. So far I have not been successful with advanced Hodoku and am doing far better cross referencing. Eventually I want to make a game where each player picks 2 squares and gets 1 point per solved cell and half a point per partially solved cell until the grid folds. Sudoku snaps.