Description：The object is to reveal a hidden picture by drawing a block around each dot so that its shape is rotationally symmetrical to the dot, its color matches the color of the dot, there are no other dots inside it and no squares are left out at the end of the solution. There is only one unique solution for each puzzle.

Instructions：First click on the grid draws a wall and the second click removes the wall. Multiple walls may be drawn or removed by dragging the mouse.