Joel Stoneton peers into the reservoir tank of the toilet in a mock prison cell Friday during a prison break challenge at Mainely Escapes in Waterville. The new business on Main Street is part of a growing trend of escape games, of which there are at least half a dozen in Maine.

Josh Veilleux leaves Mainely Escapes with friends Emily Cates, center, Treva Campbell and Jada Boggs, back center, after completing the prison escape challenge Friday in Waterville. The group said they'd take the challenge again. It required them to solve puzzles and mind games to get out of a locked room in an hour.

Joel Stoneton celebrates escaping the prison challenge Friday with friends at Mainely Escapes in Waterville.

Casey Avery, left, shines a light on possible clues tacked to a cork board Friday as his group tries to escape from the prison challenge at Mainely Escapes in Waterville.

Casey Avery shines a light on the locks on the door to his group's freedom during the prison break challenge Friday at mainly Escapes in Waterville.

A group of problem-solvers inspects the "warden's office" they escaped to Friday from their "prison cell" during an escape challenge at Mainely Escapes in Waterville.

Adam Handsbee, center, pumps his fist in joy as he and his business partner at Mainely Escapes, Bill Tiner, watch on a monitor Friday as a group negotiates the jail break challenge in Waterville.

A group of sleuths inspect a "prison inmate" for clues on how to escape the cell they have been locked in during a challenge Friday at Mainely Escapes in Waterville.

Joel Stoneton reaches in to the reservoir tank of the toilet Friday in a mock prison cell during the prison break challenge at Mainely Escapes in Waterville.

Adam Handsbee, right, co-owner of Mainely Escapes, offers instructions to a group Friday before it begins the prison escape challenge in Waterville.

A group of problem solvers wait for instructions to the prison challenge Friday at Mainely Escapes in Waterville.