Musical Box
You decide to follow the music from what you presume is a music box. The lobby seemed small at first glance but as you walked around trying to find the source of the music you found it rather spacious. You were somewhat perplexed as the sound sometimes came from the walls, other times the ceiling, and even the floor.
After snooping around for quite a while you start knocking on walls, trying to check for secret entrances, it was a spooky mansion after all. After a few knocks you felt a wall, or what seemed to be a wall, shake with your knock. You pushed and pushed, only to notice there was some kind of tiny hole within the "wall". You remembered from looking around the room that there was a sort of key laying on one of the tables.
You grab the Key and put it into the hole, slowly turning the key until "CLICK", the door opened! It lead down a set of stairs and you could now clearly hear the music box. You walked down the stairs to find yourself in a small room. The room had a panel on the wall and a window, the window looked over a forest. You could tell the panel was the source of the music and after spending so much time, you just had to get to the bottom of this.
As you were about to open the panel, something in the forest caught your eye. A loud BOO! followed by "KRRZZTSHH!" and a blinding yellow bolt of light and energy appeared from the middle of the forest.
Suddenly all the lights in the mansion turned off. Seems the power went off. A loud cackle echoed through the forest and into the house.
But that would soon be the least of your worries as all around you.. coloured blobs started appearing. You were no longer alone.