Toy Ghost has added a new donation tier to its ongoing Boogerman 20th Anniversary Kickstarter campaign, awarding an exclusive co-op mode featuring 16-bit platforming star Earthworm Jim to backers who pledge $40 or more.

The new mode is available as a backer-exclusive add-on, and is not included as part of the core Boogerman revival itself. The pack adds Earthworm Jim as a playable partner character, along with a batch of exclusive levels designed for co-op play. Backers will also receive a t-shirt emblazoned with EWJ and Boogerman himself.

This crowdfunded team-up marks the first time Boogerman and Earthworm Jim have worked together since 1997's Clayfighter 63 1/3 for the Nintendo 64. Regarding Boogerman's oddly clean-shaven look in the picture above, Toy Ghost notes that the team "forced him to clean up a bit for the picture." Earthworm Jim has standards, after all.

Earthworm Jim creator Doug TenNapel wrapped up his own Kickstarter campaign earlier this year for the Neverhood follow-up game Armikrog. Since its launch last week, the Boogerman 20th Anniversary Kickstarter project has earned over $25,000 toward its funding goal of $375,000.

This article was originally published on Joystiq.