SudoKoi: Smart & Clean Sudoku

Choose a difficulty or mode to start a new puzzle. Fill the grid so each row, column, and 3x3 box contains digits 1-9 with no repeats. Tap a cell and use the number pad to enter numbers; enable Notes to add pencil-mark candidates. Use smart hints to learn step-by-step logic without revealing the whole solution. Toggle error checking, highlight duplicates, and use undo or redo to manage mistakes. Complete puzzles to build streaks, improve your stats, and tackle tougher challenges and daily runs.