Sudovaria is a game with Sudokus that are manually designed by Folkert van der Meulen Bosma with a unique solution that are a combination of Sudokus with variations: grid sizes (from 4 by 4 to 12 by 12), block shapes (Sudokus with irregular shapes or chaos Sudokus), symbols (numbers and letters) and overlapping (2 or more complete or partial overlapping Sudokus). Patterns and figures comes at three levels: Beginner, Advanced and Professional. These Sudokus are unique to solve using pure logic and good reasoning. After the initial purchase (21 Sudokus) 12 sets of 3 Sudokus become available for free each month.