The victory by the 17-member Purdue Society of Professional Engineers was the team's third such win in the past four years in the contest, named for the late cartoonist known for his drawings of complicated devices performing simple tasks.
Texas A&M University placed second; the University at Buffalo in New York was third.
After winning the regional contest in February, Purdue's team added 55 more steps to perfect its machine, said captain Drew Wischer.
"We put 4,000 to 5,000 man-hours into this machine since September, and all the hard work has been well worth it," said Wischer, a senior in aviation technology from Cedarburg, Wis.
The competition, sponsored by Phi Chapter of Theta Tau fraternity, rewards machines that most effectively combine creativity with inefficiency and complexity. Machines must complete the assigned task in 20 or more steps.
Winning machines must complete two successful runs. Points are deducted if students have to assist the machine once it has started. Judges award points on the creative use of materials, team chemistry, flow of the machine and each machine's theme.
Other teams competing Saturday were Ferris State University in Michigan; Michigan Technological University; Penn State University Brandywine; and the University of Texas at Austin.