PITTSBURGH—The world's largest hand-drawn maze is short on people who want to solve it.

Joe Wos, 42 years old, is putting the finishing touches on a 35-foot-long, 4-foot-wide maze filled with thousands of U-turns, intersections and dead ends, and populated with frogs, tuna and pancakes. He is hoping for a world record, but one requirement is that somebody else solve it. That is a problem. Nobody really wants to.

"Let's face it, it will be a pain," acknowledges Mr. Wos, who estimates the task at 30 to 40 hours. There is also a slim chance he has inadvertently sealed the winning path. "I'm 99.4% sure it can be solved," he says.

He has asked family, friends and a board member on the ToonSeum, a small cartoon museum in downtown Pittsburgh that Mr. Wos founded and directs.