One strategy for Troll Marsh Level 21A, The Monolith, is to topple the main tower so it rests atop the boat. Drop the last Viking on top of it, and slide the treasure chest down the secret passage on the right. Cut the ice blocks down to size to help the hammer-wielding boater. For a 3-cut par, cut the main block closer to the Vikings, and quickly follow by dropping the top Viking into the sliding block. If both land in the boat,muse the last cut to make the blocks small enough to smash.
If you have a different strategy for completing this level feel free to leave a comment below.