After beating the puzzle on Whysoserious.com/Bamboozle, Whysoserious.com/Bamboozle/2l43kjsa892nn2.htm was found. The site depicts the exit of a circus tent. Clicking on the the exit brings up 10 tickets with images on them.
To win, you must click on the four tickets that show up upon beating the games at Whysoserious.com/Laughtilithurts, Whysoserious.com/Redballoons, Whysoserious.com/Punkdrop and Whysoserious.com/Bamboozle. The tickets are: school bus, alarm bell, duffel bag and vault door. Clicking on these four leads to Whysoserious.com/Overture.
(Whysoserious.com/Bamboozle/2l43kjsa892nn2.htm) -- direct link