Have you ever cut a tree before? Think about a huge tree. Will you manage to cut it?
There will be a very big tree and just an ax. You will start cutting the tree from the top. Whwn you arrive to the root of the tree, you will start with another map.
The game starts only one ax. As you hit the ax to the tree, you will win coins. Each hit will bring you 1 coin. With these coins you can improve your ax or buy another one. So you can get much more coins at the same time. Improved axes will make you win much more coins with just one hit. And you can also add new routes for your axes.
As you pass the next map, your tree will be bigger. You will have to buy lots of axes and improve them.