Mystic Asylum. You have been chosen to rid this place of negative energy. Once you enter inside the abandoned asylum you will need to collect positive energy orbs to get rid of the negative energy. Be warned that once you enter, the negative energy will try to consume you, it will also prevent you from leaving.
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.