You must find a girl in the labyrinth of an ancient castle, then make her drunk, and receive a strip show from her... When she demands to bring some drink (or etc...) - go and find it somewhere in this castle rooms (the Map is available).
You must be hurry, because she will not wait for a long - just 1 minute! And after her show, she may give you a key for the door to the next floor...
Move with arrow-keys; to enter, take item, etc.? - click on it.