Lets hear some more reasons why these are the easy. Not just how long it takes to master a game, but things like, how long of a break you can safely take and how often.
Punchout!! Is fairly easy to learn and loop for many millions. The issue with marathoning PO is breaks. The longest break you get is about 30 seconds and that happens 5 minutes into the game. That and you dont get extra men.
Im sure there are lots of games that are easy in tbis sense but to "marathon" them is another story.
Also, what are you considering a marathon? 12 hours? 24 hours? Or something else?
Hec