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thanks for the advice. I'll keep thinking about this. I would especially want to get some tips from adum, about how he managed to get to level 1048

Hello guys, I'm trying to solve the game with a simple recursive backtracking algorithm, but after level 60+ it became terribly slow. I couldn't come up with any idea on optimizing the algorithm. I made a sudoku solver with the same technique and there I could select the path by selecting the branch...