Ultimate Sudoku

A popular puzzle game originating from Japan that has gained widespread global recognition and acclaim.
The objective is to fill in the empty cells with numbers ranging from 1 to 9. Each row, column, and 3x3 block must contain the numbers 1 through 9 exactly once, without any repetition.

3 distinct game modes are available:
Cell First: First select the cell you wish to fill, then choose the appropriate number.
Number First: First select the number, then click on the cell where you want to enter that number.
Note Mode: Utilize the keyboard or number buttons to input notes or potential options in the empty spaces.

Fill in the blank cells with the numbers 1 through 9. Ensure that each row, column, and 3x3 block contains the numbers 1 to 9 exactly once, without any duplicates.