This article is about comic series. You may be looking for the show.
The Amazing World of Gumball is a comic book series published by BOOM! Studios. The series was written by Frank Gibson and illustrated by Tyson Hesse. The first issue also has five variant covers, while the subsequent issues have only three.  The main series ran for a total of 8 issues before being cancelled for unknown reasons. However, one-shot issues, as well graphic novels, are still being published.
The comics apparently take place in Season 3 because of the presence of Coach and unshelled Penny's appearance in Issue 6.
Note: These issues were announced at BOOM! Studios' monthly solicitations months prior to their (now cancelled) release. As they are scrapped, all that remain are the covers produced for these issues. Those covers are later recycled for other comic publications.