The Magic Mirror has an important message for Shrek. You see, it seems that the evil sorcerer, Merlin, has captured the lovely Princess Fiona(TM) and has her locked in his Dark Tower Fortress of Pure Evil...Wha ha ha ha!

In order to face off with Merlin, Shrek must travel to the Dark Tower Fortress
of Pure Evil (…Wha ha ha ha!), but a thick and foul fog surrounds it. The only
way to clear the fog and gain access is to perform Good Deeds across the Fairy
Tale Lands. To help him out, the Magic Mirror gives Shrek a Book of Good Deeds
and offers to teleport Shrek to places where Good Deeds are required…