once the intruder is in the box, he has to get low and bite the feet of the defender however many times it takes until the defender gives up and leaps out of the box. i won this game a lot because i'm quick and a good feet biter. Ched is too gentle and not a biter. still he was a good sport. Dennis also played, but did not like me biting his feet, so he quit after only two rounds. i made Ched play for hours.