Step 1 - get a secluded area of the floor and barricade it with baby gates, dog gates, or similar
Step 2 - duct tape a bunch of sharp knives to a roomba in various orientations
Step 3 - place sharp roomba into barricaded area of the floor, now called “the arena”
Step 4 - each participant blow up 3 balloons, all of the same color for each participant, each participant having a different color than each other
Step 5 - simultaneously, everyone toss their balloons into the arena, then turn on the sharp roomba to roam

Participant who has most balloons remaining after 3 minutes is winner.