Collie

You are the Collie. The sheep are afraid of you. 

Walk up to a sheep and it bolts one tile away from you. That's your only tool — you never push, pull or grab anything. To get a sheep into a pen you have to stand in exactly the place that makes it run where you want.

Fifty hand-made levels teach six ideas, one at a time:

• The nudge — get behind them, and mind the walls.
• The bark — one shout, every sheep moves at once. You get one per level.
• The black sheep — it panics twice as hard and runs two tiles. It will overshoot the pen unless you give it something to stop against.
• Hay bales — the only wall you get to place. Shoving one is a commitment.
• The burrow — a tunnel under the field. Sheep go in one end and come out the other, and so do you.
• The wolf — it hunts the nearest sheep every time you move. Step beside it and it backs off. Bark and it loses its turn. Corner it with a bale and it stops moving altogether.

Controls — Arrows or WASD to move, Space to bark, Z to undo, R to restart. Plays with mouse, touch or gamepad. Works on phones.