As the number of blocks decreases, it will be harder and harder for you to reach the block you need. In this case there are two supplementary keys to help you - Z (or End) and X (Or PgDn). You may revolve the line with your sapper to the left or to the right. One more useful feature is connected to playing field organization. When your sapper leaves the playing field at the left he appears at the right side. If he leaves at the bottom he will appear at the top and vice verse. From the 5th level the non-rotating blocks will appear.