The strategy for Hammerfest Level 12, The Block, is to cut twice diagonally under the treasure chest to remove a small slab. Use a few cuts to make the chest’s ice block as small as possible, then cut just above the nails to release the entire block. Guide the chest and Viking into the boat for the coin objective. When trying the 4-cut par, simply make a horizontal cut above the nails and a vertical cut just left of the Viking. As he falls, cut closer to make sure he falls into the boat. Last time I checked, three was less than four!
If you have a different strategy for completing this level feel free to leave a comment below.