Press Scramble to scramble the board.

Press Reset to reset it.

The red box forms an elastic band around the squares. It can be moved by clicking on a number. Using the left mouse button moves the top-left corner, the right button moves the bottom-right corner.

Pressing either of the two arrows rotates only the outer squares of a rectangle, either clockwise or anti-clockwise.

The idea is to return the grid to the reset position.

by Jon Perry