Choose:  

|   Easy-1

|   Easy-2

|   Medium-1

|   Medium-2

|   Difficult-1

|   Difficult-2   |

Time:

 You know the rules of Sudoku? There is only one!
 Fill it on, but in each square and in each row or in each column no number appears twice or more!
 Drag the numbers from the right side and drop it into the free squares!
 It is possible to overwrite your own numbers again! Or take the tenth and clean them with it!