Sudoku Happy Day

Happy Sudoku is a clear, easy-to-start Sudoku app. Classic 9×9 Easy, Medium, Hard, and Expert. The selected cell, its row and column, and matching numbers are highlighted. Wrong entries count toward a mistake limit. Diagonal Both main diagonals must also contain 1–9 with no repeats. Daily challenge One fixed puzzle each day. Notes and tools Mark candidates, or mark digits in red to exclude them. Erase, undo, and redo. A few hints each game. Timer with pause. Learning mode A 4×4 board for learning the rules before the full grid. Symbol themes Switch from numbers to animals, fruit, or colors. Themes and stats Several palettes and text sizes. Local stats by difficulty. Resume an unfinished game from the home screen. Offline. No account. Progress stays on this device. Includes banner ads.