Digger Ball is a tunnel-digging puzzle with one important rule of physics: a ball only rolls downhill. You have to dig a corridor for the ball to slide all the way down to the target, and the slope is everything.
Draw a tunnel through the ground from the ball to the target. Obstacles such as iron and wooden planks block the way, so your tunnel has to turn around them. Keep in mind that if any part of your tunnel is flat, the ball stops rolling. Every section needs to keep going downwards. Some levels are easy, some take a few tries, and all of them are hard to stop playing.