Willow Challenge?

I keep seeing librarians, moles and teachers for a challenge but I can't see anywhere what the challenge involves.

I've finished three games with a mole, won the first and nothing happened. In the middle of the second a box came up saying 'score against Mole - complete' and I'm not sure what's going on or what the next goal is.

Quite new to the app so this is my first encounter of this challenge.