10 teams of students, and their plastic robots, took part in a fierce competition Saturday to see whose robot would move on.
The students, ages 9 to 14 gathered at the School of Mines in Rapid City, to show off their hard work.
They spent weeks on their Lego robots, which will be graded on how well they perform specific tasks on themed playing fields.
Grades are also assigned based on team posters, demonstrating how each team worked together to design the robot to solve various problems.
The winners of this match will move on to state competitions, and possibly even world finals.
"We put a lot of work trying to squeeze everything in on short notice, but we got it all done and I feel really confident on how we're going to do," says Ian Veurink.
"In the long run it's not really about winning it's about teamwork, cooperation, and learning how to build robots," says Randy Horn.
All of the legos were supplied by the School of Mines and Caterpillar.