Sudoku (Privacy Friendly)

Privacy Friendly Sudoku is a logic puzzle game. The goal is to fill the complete board with numbers. Every number may only occur once in every column, row and subsection. Privacy Friendly Sudoku has three different game modes: 1. A 6x6 game field with 2x3 subsections. 2. A 9x9 game field with 3x3 subsections. 3. A 12x12 game field with 3x4 subsections.