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.