A note under my door.

So, I sit here in my room, thinking of ideas for something to do. I've been having sleep issues recently... blathering, yeah. sorry.

So anyway, I'm sat here, and I do a search for a blogging website. And that's when it happened. I got a note under my door, which basically read like this:

"Let's play a game."
"It's called the Long Game."
"It'll start soon. You'll see him."
"Don't underestimate him."

I'm very confused. I'm alone in the house. So who slipped this note through?
I'm not liking this.