Twilight Princess. I beat it 8 or so times and have an (active????) memory on where (just about) every little secret is. I know where all the Heart Pieces are, I know most of the other locations for other secrets, I know what the story is (obviously), and I could probably even quote multiple sentences- word-for-word. (And if I mess up doing so on one- that'd be because I'm rusty- but I definitely could at one time)
I think TP is the first Zelda game I absolutely fell in love with. My second would be Majora's Mask, being that I didn't play it until YEARS later- when I got my first N64 from a local flea market. Though MM is my most favorite Zelda game of all time. (so-far)- with Hyrule Warriors coming up as a close second, if you count it.
And, no, I don't think I consider myself to be a master of Majora's Mask quite yet. I need to play it a few more dozen times or so. xD
(actually, I'm not too too far off from my TP beat- count.) I've played MM roughly 5 or 6 times so far. I'm trying to memorize when to do stuff at the most convenient time, so I could perhaps speed run it someday after I master it. I mean, that's all there really is to beating MM successfully. Knowing when to do things, knowing how to do things, and knowing what the most convenient time to them is. In order to master this game, it requires a lot more memorization. (time schedules and such) ...which does take more time than being a master at TP.
TWW. I know a lot of secrets that even the Prima guide didn't cover.
Oh, the guides never cover everything.
There are even moments in which they cover something, but totally get it wrong.
For instance, in the 'official' guide to Majora's Mask. There's a specific frog that in one part of the book, they tell you it's in the Snowhead Temple, and in another section they say its in the Great Bay Temple -WHERE IT REALLY IS. The worst part about it though, it's not just a typo or a text error. They actually show an image of inside Snowhead Temple indicating what the temple it's found in looks like. (or so my memory serves me- I stopped using my Prima guide because of this) ...on top of that, the rest of the guide is riddled with inaccuracies all through it. Little things though, like rephrasing answers to the Keaton quiz, instead of taking it word for word, and pasting the same song button image for two songs. -what I mean here is they used the same image (same notes and all) of one song, on another song in the ocarina songs list. Simple image to text error, but still an error none the less. (I didn't even cover ALL the inaccuracies I found- by the way) ...in short, I think this book was trying to make a subtle pun. That being "I AM ERROR"....
More or less, I could say my satisfaction of this guide is "grumble, grumble".