Just a few days ago I found out about one of the most fun internet games, Linerider!
Here's a link to the website http://www.linerider.com/
Linerider is a game where you draw lines and move a kid on a sled through pretty much anything. There are three types of lines:
Blue: normal lines.
Red:lines that propel the character at a fast pace.
Green:lines used for scenery that are not solid.
For further instructions on playing the game, play the game and press he "H" key.