I also have a few star targets as well, makes them a little more challenging if you start them off spinning but once you figure them out they become a bit less of a challenge.
https://www.youtube.com/watch?v=02FNsp4-6NQ
I also built one that had no shoot targets the counter rotated behind the plates. When I used it in a match it was shocking how few misses there were vs a regular run. Amazing what people can do when they take the time to aim.
You can also run them strong hand only and weak hand only to add to the challenge.