TY  - BOOK
TI  - Sudoku: four levels of difficulty
SN  - 9781851285358
U1  - 793.73 
PY  - 2024///
CY  - United Kingdom
PB  - W.F. Graham (Northhampton) Ltd
KW  - Sudoku
KW  - Juvenile literature
KW  - Mathematical recreations
KW  - Logic puzzles
KW  - Puzzles
KW  - puzzles
ER  -