SudokuLandD ~ 6,000 original problems ~

The best feature of SudokuLandD is that it's free and you can play with original problems! On top of that, there are 6 difficulty levels, with 6000 problems in total. We have organized the questions by difficulty level from the simplest to the hardest. Use it for brain training and dementia prevention. Even the on-screen operations of the game are simple.