I remember now. I found PD through the Pikachu Skateboard game, not because of the drawing boards. It was a game that was hosted by Nintendo, but ever since Nintendo dropped the game all of the fansites who also hosted the game lost the data. So PD has a broken game on the site.
I used to play it for a good hour or two at times. I was pretty good at it after a while, but there was no music so I would have iTunes playing in the background.
Now-a-days I just play something like Robot Unicorn Attack...
It's weird how long I used to be able to do literally one thing on the internet in one sitting when I was younger. Now I have to keep switching websites to look for new content to absorb or else I get bored.