Runescape pre-2007. I tried to play Soulsplit (which is a relatively popular Runescape remake) but it just isn't the same as when I used to play it.
 
Majora's Mask and Runescape.

I still really really love Ocarina of Time, it even taught me how to read on a 6th grade level when I was 5.
 
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For me it has to be Sly Cooper. Loved it till the end.
I have to agree there, I got Sly Cooper and the Thievus Racoonus or however it was spelled when I got my PS1, and made damn sure to get Sly 2 and Sly 3 on release day. I don't know what happened to my copy of Sly 1, but I've still got Sly 2 and 3, gonna buy 4 when it comes out.