- 2004/DEFCON 12
- Build a mobile robot that can pick up ping pong balls and transport them across an arena.
- 2005/DEFCON 13
- Build a mobile robot that can traverse an arena picking up ping pong balls, then shoot down cans with them.
- 2006/DEFCON 14
- Build a shooting gallery robot, timed tournament
- 2007/DEFCON 15
- Build a shooting gallery robot, elimination tournament
- 2008/DEFCON 16
- Build a shooting gallery robot, elimination tournament
- 2014/DEFCON 23
- Build a robot that can shoot lasers at a moving target
