At the coordinates -336 704 in Our World of Pixels, lies the creation made by dimden, pong.
It is protected likely to avoid griefing.
How to play it
To play it, just simply move your cursor over the buttons on one side to move one of the paddles.
How it works
You can likely see the cursor just sitting on the pong game itself, well that is one of the many bots of owop.
Just like you can see other users near you, the bot can see when you hover over the buttons, and draw accordingly.
Calculator - a similar (no longer active) creation