Tip: don't push them into a corner! I got up to lvl 7 without a problem, and then I got them stuck in a corner and that was it :( Poor sheep will spend the nigh

Tip: don't push them into a corner! I got up to lvl 7 without a problem, and then I got them stuck in a corner and that was it :( Poor sheep will spend the night in the cold outside the barn!