Sudoku Solver: Scan & Play

Point the camera at a sudoku in a newspaper and keep playing it here. No interruptions. No banners. No ads between puzzles. SCAN A PUZZLE FROM PAPER Photograph the grid and the app reads it — the printed clues, the answers you have already written, and a candidate from each square you pencilled in. It tells the three apart by the ink itself, so what the paper printed stays locked and what you wrote stays yours. Check it against the page in two steps, fix anything it misread, and carry on from where you were. The photo is processed on your device, is never uploaded, and is deleted before you leave the screen. HINTS THAT EXPLAIN, NOT JUST SOLVE Ask for help and you choose how much of it you take. First where to look. Then the name of the technique and why it works here, on your board, with the cells marked. Only then the answer. Twenty-six techniques, from Naked Singles to XY-Chains — and…