In Shaun the Sheep: Silly Slingshot Stacker, your goal is to stack the sheep all the way up to the window. Pull the underwear back to see the direction the sheep will go when you launch them, and aim them so they'll land on top of each other. Reach the window to activate the next level.
Sometimes you'll have two sets of sheep, with red and blue underwear. This can be handy when you need to come in from a certain angle.
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Click the underwear and drag down to set the angle and power of your slingshot launch. Aim to land in a way that lets you put more sheep on each other's backs so you can reach the window. Watch for items that may be of use, such as boards. In some cases, you may need to time your launch so it hits the board at the right moment.
Tips and Tricks
If necessary, you can "bump" your existing sheep to get them closer to the edge of a platform. In one level, the sheep are balanced on a board. The best way to keep the board from falling is to aim toward the pipe so that the sheep falls straight down and helps keep the board in position while you launch another sheep from the other side.
Shaun the Sheep: Silly Slingshot Stacker Review
This is an interesting little physics-based logic puzzle. It took me a few tries to figure out the level where the sheep are balanced on both sides of a board. Basically, I had to just keep plugging away and got it right through trial and error. The graphics are pretty decent, but the audio may go out on you. Of course, that might be a good thing.