Learning
It's a very simple game, however, don't get fooled by its simplicity. Lots of aspects like coordination, time management, leadership roles, communication, working in a team, etc. evolve through this activity. Since the pieces are cut into different sizes, the players running to bring the pieces have to choose the longer ones from the wool heap. The people tying have to be quick and have to work in coordination with the others. Since only one long thread is allowed, it's necessary for the team to stay together. Final win belongs to the team and not individuals.