I am searching a very old, but special game, and it´s too long ago (about 10-12 years), so that I can not remember the name of it. It was a mix between a "jump´n´run" and an adventure game.
There was a tower with many doors and steps, and the little animal (I think it was something a like a pig) had to go around the tower on these little steps. It could also go into the doors, but the player never knew, on which door the animal will come out again. The next level (a more difficult tower) was reached, if the player had found the door on the top of the tower.