BLOOMINGTON (WJON News) -- A growing high school activity's season has gotten underway. The VEX Robotics competition season kicked off this week at the Mall of America. The University of North Dakota College of Engineering and Mines' Signature Robotics Competition will feature about 120 high school teams. Get our free mobile appTeams are battling for four invitations to the VEX Robotics World Championships.The event also launches VEX Robotics' milestone 20th season and marks the 5th anniversary of Signature Events at Mall of America. Cloud Sign For over two years, the sign outside the St.