Sudoku, a medium difficulty number puzzle with a solution.
Keywords
sudoku,
puzzle,
medium,
number,
brain teaser,
solution,
strategy,
entertainment,
grid,
challenge,
educational,
mathematic,
fun,
problem solving,
recreational,
activity,
gameplay,
concentration,
two-sided,
board game,
hobby,
competition,
addictive,
analysis,
engagement