Xavier Cullen took 22 rolls to make 50 6-sided dice all turn up the
number 6, also known as a "Yahtzee."
Cullen began by rolling all the dice at once, pulling all dice that
landed on ‘6’ off to the side. He then re-rolled the remaining dice,
removing all 6’s after each roll. It took 22 rolls before all dice
landed on 6.