Gridsolve

GridSolve is a clean, ad-free classic Sudoku puzzle game. Every single puzzle is generated fresh on your device and verified to have exactly one valid solution before you ever see it — no guessing games, no dead ends, just real logic-driven Sudoku. No account, no ads, no internet connection required. HOW TO PLAY - Fill the 9x9 grid so every row, column and 3x3 box contains the digits 1 through 9 exactly once. - Tap a cell to select it, then tap a number on the pad to fill it in. - The selected cell's row, column and box are highlighted automatically, so you always see what's already ruled out. FOUR REAL DIFFICULTIES - Easy, Medium, Hard and Expert puzzles, tuned by the number of starting clues — from a gentle ~40+ givens down to a sparse 24-26 for Expert. - Every puzzle at every difficulty is generated with a randomized backtracking algorithm and checked with a solver to guarantee a unique solution, regardless of how sparse it looks. FEATURES BUILT FOR REAL SOLVERS - Notes / pencil-marks mode — jot small candidate numbers into any cell without committing to an answer, exactly like solving on paper. - Optional conflict highlighting — instantly see cells that clash with the same number in their row, column or box. - Optional same-number highlighting — shade every cell that already holds the number you've selected. - Hints — reveal the correct value for your selected cell (or the next empty one) when you're stuck, with hints-used tracked per puzzle. - Undo — step backward through your move history, including note toggles and erases, not just final answers. - A live timer for every puzzle, with your best time saved per difficulty so you can chase a personal record. STATS THAT STAY ON YOUR DEVICE A dedicated Stats screen tracks puzzles completed and best time for each difficulty, your total puzzles played, and your current daily play streak — all stored locally, never uploaded anywhere. FOUR APPEARANCE MODES Choose System, Light, Dark, or a pure Black & White theme for maximum contrast and battery savings on OLED screens. PRIVACY BY DESIGN GridSolve works completely offline. There is no account, no sign-in, no ads, and no analytics or tracking of any kind. Your puzzles, notes, settings and stats are stored only on this device, and you can clear them at any time from Settings. Whether you're a casual solver working through Easy puzzles on a coffee break or an Expert-level regular chasing your best time, GridSolve is a quick, focused, genuinely-fair Sudoku experience that respects your time, your data, and your battery. CATEGORY -------- Puzzle SUGGESTED TAGS -------------- sudoku, puzzle, number puzzle, logic game, offline game, brain game, pencil marks, notes, single player, no ads, casual, classic sudoku