It’s simple, really. Just 4 of several races. 3 are required. You must complete the Honey Badger 100, the Hawk 100, and Heartland 100. The other races are Prairie Spirit 100, Ultrapalooza 100, Kansas Rail to Trail 100, and Hell Creek 100.
I’m actually going for the “super slam.” Six races in the calendar year. I’m registered. They are (mostly) paid for. All that’s left is the actual running. Easy.