A cloud of points. Guess how strongly they go together, slide to your number, and confirm. Other than that, there is nothing to win. In the corner stands an elephant. He does nothing.
Slide to your guess and press Confirm. You'll be told how far off you were, and nothing more.
This game has no prizes attached. This game has no strings attached. This game has an elephant attached.
From The Regressive Backbone · Chapter 3 — The Little Rectangle · guessing a correlation by eye