Use WASD or the Arrow Keys to move in Math Push. Press R to restart, U to undo your last move, and ESC to go back to the menu.

To get rid of the barricades, you need to push the number blocks so that they form equations that either add (or subtract) to each of the black and white numbers blocking the portal. Where you place your numbers in the equations will have a big impact on the result!

HINT: You can put two number blocks together to create a two-digit number.