Level S-14 is the space Egg level in Pig Dipper. To unlock this level, you must 3-starring levels 6-1 through 6-10 of Pig Dipper.
Very hard to deal a lot of pigs with only three eggs. But 3 stars is easy to achieve if you completed the level.
Send the Egg into and then back out of the water, pulling the northeast tower westward. This can have varying degrees of destruction, but you must detonate at least two out of the three TNTs to have a chance at 3-starring the level. If necessary, you can use another Egg to clear the level.