Troll Marsh Level S1, The Secret Path, is part of the “Sacrifice Side Quest“. To unlock this level, you must sacrifice the troll in Level 16: The Sacrifice. Our strategy is to grab the coins on one try, which is as simple as timing your swings. For par, however, cut the two outside ropes as quickly as possible. Cut the remaining ropes when the Vikings reach the apexes (apices?) of their swings.
If you have a different strategy for completing this level feel free to leave a comment below.