When I was a very young lad (can't have been more than 4 years old), I once had this enormous bundle of rope that was very tangled. Everyone said to leave it and we'd go get some new and left me on my room for a while (it was for flying a kite for what it's worth!). But I thought it was a waste and having nothing better to do I sat down and untangled every little knot there was, so lo and behold: after half an hour (possibly, I wasn't counting!) I presented everyone with the fully untangled rope! If you're as stubborn as me, here's a game that recreates that experience :).