Hey look, it's the annual Mario Marathon! Watch these guys and gals play Mario games for charity, because both Mario and charity are excellent things.
The gist is this: the folks behind Mario Marathon play through as many Mario games as possible, progressing through the canon based on how much money they raise for Child's Play. As they reach certain amounts of money, they'll keep adding games to the list. Here's the full list of tiers.
Watch here: