look at the three snowed hills, the third hill, click on it. Then you break the first five ice blocks. Then you break the next set of block. Next you hit the two wooden blocks to push the barrel on the pile of metal and ice blocks. Make sure that barrel is facing the two guys. Finally, shot the small regular meatball through that same hole but don't hit the wooden blocks so that it can hit the barrel and it will blow up and kill the two guys.