1. Super Mario Bros - Pure nostalgia vote. My sister and I were so excited to get this Christmas of 1989. Mario 3 and Super Mario World are the superior games though.
2. Mario Odyssey - specifically the New Donk City song. Few things break through to make me smile, and this song did. Probably the most fun I had in gaming in a very long time
3. Portal 2 - Puzzle platformers are my jam
4. Zelda: Ocarina of Time - More nostalgia. I was so excited to get this game, I had trouble sleeping. It was worth the wait - lots of fun.
5. Out of This World (also known as Another World) - absolutely beautiful game. It's one I replay every couple of years, having played through on the Sega Genesis, 3DO, Sega CD, and PC.