Jigsaw Sudoku or Irregular Sudoku (Mini Sudoku Series #23)
Mini Sudoku 5x5 pro" - Idee, Gestaltung, Medien & Unterricht
Amazon | Chain Sudoku Level 1: Very Easy Vol. 16: Play Chain Sudoku With Solutions 5x5 Five Numbers Grid Easy Level Volumes 1-40 Sudoku Variation Cross Sums Games Solve Japanese Paper Logic