Originally, Sudoku is played on a grid of 9 x 9 spaces.

However, In this game, we have 3 different version
1) 6 x 6 spaces made up of 4 x 2 spaces
2) 9 x 9 spaces made up of 3 x 3 spaces
3) 12 x 12 spaces made up of 4 x 3 spaces

Each row, column and square (9 spaces each) needs to be filled out with the numbers 1-9 (A, B, C in case of a 12 x 12 space puzzle) without repeating any numbers within the row, column or square.