Sudoku Vintage Classic Puzzles - 123456789 & the most addictive number logical game ever. Sudoku is a famous logical math game, in which you have to put numbers in range 123456789 in to the blank cell of 9x9 grid. One line, row and 3x3 block must have all numbers from 1-9 and not any same numbers can be on the same row/column/blocks.