Grades 2 & up. Reinforce concepts of time to the quarter hour in digital, analog and word format with this great hands-on game. Everything you need to complete 10 increasingly challenging Sudoku puzzles with special time chips. Simply use the chips to cover the board so that each row, each column and each 2 x 2 box contains one each of the four times. Includes 360 punch-out chips, 10 color-coded game boards and an answer key.