Sheep trot down the lane. Send white sheep to the left pen and black sheep to the right before they wander off. Three mistakes and you're done.
Sheep trot down the lane one after another. Send each white sheep to the left pen and each black sheep to the right pen before it wanders past the fork. Three mistakes and the game is over.
More games you might like: Orchard Catch · Hay Stack · Barn Swallow · Mole Patrol