You have to arrange 8 pieces, which consist of several lines, to a square. A single piece can be turned within its field by "+" and "-" and it
can be shifted by the arrow keys. After pressing the space bar you can move the piece from its field to the field in the middle by "+" or move
it back by "-". Now you can change the selected field by using the arrow keys. You can also use the mouse (click to select a field and "drag"
to move or move back a piece).
If you are in mode "easy" then the position of the field is equal to the position of the piece in the square. If you are in mode "difficult" then
the position may be exchanged in pairs (top-bottom, left-right).
Here you have to arrange the last two pieces, then the game is solved.