or Zelda is Really Hard to Follow

I was thinking today about Zelda: Twilight Princess and, to be honest, I couldn't remember much about it. Then I thought that it was simply a case of me not remembering Zelda games in general, but then I started thinking about Ocarina of Time, I sure remembered A LOT about that game. Being one of the most fondly remembered games of all time, I couldn't remember that game more. So, that got me thinking I should replay Zelda: Twilight Princess (Ugh, not something I'm going to do anytime soon.) to see what I missed/don't remember. Then that got me thinking about what makes a game fun to replay. Well, no it didn't really, writing this got me thinking about that, but...Anyway what do you guys on the (insert board here) think is a good candidate for a replayable game.