Book Catalogue	Group Sizes	Grid Sizes
Junior Titles	4 to 6	4x4 to 6x6
Intermediate Titles	7 to 8	7x7 to 8x8
Sudoku Titles	9	9x9
Sudoku-by5 Titles	9	21x21
Advanced Titles	12 to 16	12x12 to 16x16