Chases would be cool.. count the number of coachroaches they can eat in 30 seconds or something like that. just make sure there are no hens around or else they'll just pick em up and drop repeateldy, trying to coax a hen over to eat it. Or maybe that can be a competition for hens... because hens go crazy after food.There could also be utilized the swinging perch. And a chase, like chasing cockroaches! I like as much one on one, like the tug-o-war, but that's hard.