Today only you can download the Sudoku 4Ever Plus game app for Android for free (regularly $1.99) on Amazon.
Every puzzle included in Sudoku4ever has a unique solution and can be solved using logic only (no guessing), although there's a controversial discussion going on in the Sudoku community about where logic ends and guessing starts, and which solving technique belongs to which category. If you doubt that a puzzle is solvable, use the solve function (the solver also checks for multiple solutions) or the hint function to get a step-by-step solution path.
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