The crossword solution for the term DIVERSION WITH 81 SQUARES is SUDOKU. Sudoku is a logic-based number-placement puzzle game that originated in Japan. The objective of the game is to fill a 9x9 grid with digits so that each column, each row, and each of the nine 3x3 subgrids that compose the grid contain all of the digits from 1 to 9. The game is played on a grid of 81 squares, divided into nine columns and nine rows.