You have to cross the river, but there is no bridge here. Fortunately, you can use wooden boxes to build your own bridge and cross the river.
Are you ready to solve some real issue? This care should pass on the other side as soon as possible, but there is one problem. There is no bridge and a huge gap between two sides of the river. Build a bridge using only wooden tools, but mind that it will be very unstable and you should pass it quickly.