Math Grid

The basics

Tap a cell, then tap a digit on the pad. Every row reads left to right as a op b = c, and every column reads top to bottom as a op b = c. When all three cells of a line are filled and the equation is false, that line turns red; a correct line turns green. Hint reveals one correct cell, Restart clears the digits you placed, and Next puzzle moves on. Every puzzle has exactly one solution that fits its given cells; there are 28 puzzles across easy, medium and hard.

Objective:

Fill all nine cells with digits from 1 to 9 so that each of the three rows and each of the three columns forms a true equation with the operator shown in that line. Digits may repeat. The puzzle is solved once all six equations hold.

Controls:

Mouse or touch: tap a cell, then tap a digit key 1-9; the ⌫ key clears the selected cell. Keyboard: digits 1-9 fill, Backspace clears, arrow keys move the selection. Buttons: Easy / Medium / Hard, Hint, Restart, Next puzzle.