What game from your childhood is most nostalgic for you?

I played Tenchu recently, and it was just as good as it was the first time I played it. Those controls are jank, but it's really a fun game regardless. It has a wonderful soundtrack, and it feels foreboding which is lovely for a ninja game. I feel the same sense of dread that I do as if I were playing a horror game or something. It's quite good!