SUDOKU - 5700 original puzzles

SUDOKU - 5700 original puzzles by Naoki Inaba offers a large collection of unique puzzles in various forms. It features eight levels of difficulty, a hybrid solving mode (number-first and cell-first), and cunning traps and original logic puzzles.

Each puzzle includes solving explanations using standard techniques, an improved hint system explaining why a number is correct, and practical in-app features: auto-save, candidate notes, color and sound customization, adjustable keypad placement, and a checker to verify numbers. Sudoku Palace is the official sponsor of the Japanese national team for the World Sudoku Championship.