Games are different depending on the judge. Some of 'em are stupid, like drinking until you're shitfaced and doing really dumb things. Others are games of skill, others will change you physically for a few days for the hell of it. It honestly depends on the judge running it.
As for the judges themselves? Surgeon, Mirror, Trickster, and Game Master are probably the most dangerous. Toss Flowers in there, too, I guess, she's kind of gone off the deep end too. Those five run the most dangerous games - the ones you get seriously hurt in, and the ones that you can die in.