how to play Mountain Baboons (Bavianenberg)

About Bavianenberg, from BoardGameGeek:

The battle erupts on Bavianenberg! The baboons are fighting for glory, but keep their identities secret in order to drive other baboons away. The higher they climb up the mountain, the more points they are worth at the end of the game. Unmask your opponents and become the Baboon King. In Bavianenberg, you try to move your baboons as high up the mountain as possible to score the most points. Keep your color a secret and try to figure out which colors your opponents are playing, so you can drive their baboons off the mountain. -description from the publisher