I built this game for my mom, who was frustrated with the overwhelming number of ads in other Sudoku apps. I’ve kept ads to the absolute minimum. Hope you enjoy the game. Normal Mode : Light and Friendly Brain Stretching Perfect for those who want quick feedback or want to enjoy Sudoku in a light and casual way. * Auto-Error Check: Instantly notifies you if you enter the wrong number. Feel the thrill of correcting mistakes and aiming for a perfect puzzle. * Smart Hints: No need to get frustrated when you're stuck. Use the hint feature to fill in the correct answer and keep the game flowing smoothly. Classic Mode : Distraction-Free, Pure Immersion Designed for enthusiasts who crave the authentic feel of solving analog Sudoku with paper and pencil, without any system intervention. * Error Check OFF: No red lights or warnings even if you make a mistake. Enjoy the true essence of Sudoku by relying entirely on your own intuition and logic to fill in the blanks to the very end. * Time Machine Feature: Instead of direct hints, a 'Time Machine' is available. If your logic gets tangled, travel back to the exact moment you made your first mistake and try again.