The logo as seen in the intro
Bonus Stage is a web cartoon by Matt Wilson that ran from 2003 to 2006 on Keentoons.
Its logo uses Joystix for “HIGH SCORE’S” (though note that this subtitle was removed by season 7), ITC Franklin Gothic Heavy for “BONUS”, and Dimitri Swank for “STAGE”.
Official shirt design
2004 main page
Main page during season 6, using ITC Franklin Gothic Demi Condensed and Medium Condensed for the character descriptions
Main page during season 7, using the same fonts as the previous one for the character descriptions
The menu of the episode 89 “DVD”, using Myriad for the menu text