This extention is a game. You are a dot and there are red obstacles that you have to avoid and get to the yellow end.
I will tell you how to and why you should, play my game.
How to Play:
In the first few levels of the game there is a dot (you), 2 obstacles and a goal. You use the left and right arrow keys to make the dot move left and right. You can use the arrow keys to go up a floor and use the down arrow key to go back down to the original level.
If you touch a red obstacle you will go back to level 1 and start over.