![]() Playing Sudoku can help improve logical reasoning, critical thinking, and analytical skills. The ultimate goal is to solve the puzzle with as few hints and as little time as possible. But using a hint will increase your final time, so use them wisely. This puzzle comes with 17 hints to help you solve the game. Expert Gold Level 20 Sudoku is the ultimate test for even the most skilled Sudoku players. Sudoku is a game of logic where players must fill a 9x9 grid with digits from 1-9 without repeating any digits in each row, column or 3x3 square. I think this is because they are impossible to solve without the use of a computer.Are you looking for the hardest Sudoku puzzle on the internet? Look no further than Expert Gold Level 20 Sudoku 9x9 with 17 hints on Sudoku99. Sadly these puzzles don't have solutions. Valid skills are easy, medium, hard, and evilĪnother good place for sudoku puzzles is this place, which holds all possible isomorphisms of 17-hint sudoku puzzles known to mankind: Tadepalli's database, run the following command, for $n being the index of the puzzle and $m the skill: To run the solver on a certain skilled puzzle of Dr. Tadepalli, run the following command, for $n being the one-based index of the puzzle you want: To run the solver on a specific problem from Dr. You will have to rely upon the solver to find these. He can be reached at His database comes with boards, skill levels, and authors, but sadly no puzzle solutions. To run the solver, type the following command: This solver requires Lua to be installed. If not then it returns back through the recursion and the previous space in the recursion tries on the next value in its index list. If it continues like this to the end of the list then it wins. ![]() For each space it cycles through all possible indexes that it can be, setting itself to the index so long as a maybe flag will allow it to. Next the solver recursively runs through the list of unknown spaces. They are each given their own list of indexes for each maybe flag set. After the board has been run through the first part, all spaces with still no known values are put into a list. The second part works like anyone would expect it to. The algorithm continues until no more spaces can be deduced this way. Any unknown space with only one maybe flag set has to be the value of that maybe flag, so we set it and continue on. ![]() Once this is done any space without a known value will have a maybe flag set for all values it could possibly be. For each of these spaces, the maybe flag indexed by the value of the known space is cleared. After this the algorithm goes through all spaces with known values. When solving for forced coloring the algorithm runs through all the spaces in the board with unknown values and sets all of their the maybe flags on. Here is how the first part works: Associated with each tile is a set of nine flags for what values the tile might be. The solver is broke into two pieces: the first part that solves all forced coloring by a process of elimination, and the second part that solves using backtracking. Either way, here it is now for your viewing pleasure. I wrote it in Lua, which might not have been the most efficient thing to do. So once upon a time I had a need to create a sudoku solver. Einstein Field Equation Solver in LuaJIT and OpenCL.
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