Nixie Sudoku, Nixie Tube Style

Nixie Sudoku is a great puzzle game for beginners and more advanced sudoku enthusiasts.
Classic sudoku puzzle is a logic-based, combinatorial number-placement puzzle.
Nice and simple nixie tube style sudoku puzzle game with 9 difficulty levels.
Level 1 has 14 digits to reveal.
Level 2 has 19 digits to reveal.
Level 3 has 24 digits to reveal.
Level 4 has 29 digits to reveal.
Level 5 has 34 digits to reveal.
Level 6 has 39 digits to reveal.
Level 7 has 44 digits to reveal.
Level 8 has 49 digits to reveal.
Level 9 has 54 digits to reveal.
Sudoku rules
Rule 1 - Each row must contain numbers from 1 to 9, without repetitions.
You must focus on filling each row of the grid while ensuring there are no duplicated numbers.
The placement order of the digits is irrelevant.
Rule 2 - Each column must contain the numbers from 1 to 9, without repetitions.
The Sudoku rules for the columns on the grid are exactly the same as for the rows.
You must also fill these with the numbers from 1 to 9, making sure each digit occurs only once per column.
Rule 3 - The digits can only occur once per block (nonet).
A regular 9 x 9 grid is divided into 9 smaller blocks of 3 x 3, also known as nonets.
The numbers from 1 to 9 can only occur once per nonet.

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