So the idea is the following: 
You are the player.
I am the game.

It starts off as a regaular, old, text-based game you found on the internet - one around which an urban legend swirls. Apparently, this game reads you, and plays you. Some even say that, after enough time, the game will attain sentience, its personality based on the player.

Will you join, and play the game?

To start, you'd simply be entering commands - very short one-liners - to which I will respond, but in time, the game will "awaken" more and more, allowing for more complicated interaction. Of course, if you feel like it, you can describe the player's actions within the RP narrative, to give me greater insight into the player.