This is my list of top 12 fun interactive websites - cool, funny, useless, creative...
Only pure websites are included. If you think I've missed something good - share in comments :)

Top 12 list:
1. Draw a Stickman - http://www.drawastickman.com
2. The Useless Website - http://www.theuselessweb.com
heeeeeeeeey! - http://heeeeeeeey.com/
rrr ggg bbb - http://www.rrrgggbbb.com/
geodu - http://geodu.de/
falling falling - http://www.fallingfalling.com/
3. HackerTyper Neo - http://fediafedia.com/neo/
4. Cookie Clicker - http://orteil.dashnet.org/cookieclicker/
5. Windows Update Prank - http://fediafedia.com/prank/
6. Burner - http://clickerleagues.neocities.org/burner.html
7. Paper Toilet - http://www.papertoilet.com/
8. Nic Cage head - http://adamusprime.tumblr.com/niccagehead
9. Direnduvar - http://direnduvar.com/#x=-12&y=-151&z=4
10. Make everything OK - http://make-everything-ok.com/
11. Why is the sky blue? - http://halftone.co/projects/why-is-the-sky-blue/
12. Doge - http://dutnall.co.uk/

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my interactive website: http://milliondollargalleries.com
intro + how to use it: http://www.youtube.com/watch?v=aZZ-LCElXcs