Nostalgia hits me for any relatively old game that I have fond memories for. Certain games just take me back to certain times in my life. Obviously, I have the most nostalgia for older systems like the Tandy 1000, NES, and SNES. But I even have some recent games from the 6th gen or newer that hit them nostalgia feels.
All the old Sierra games really
Final Fantasy 1...this one also has some musical nostalgia. We listened to The Real Thing by Faith No More a lot during this time, so that game and album are forever tied together
Ninja Gaiden 2
Double Dragon series, especially 2 and 3
Dragon Warrior 4
And any number of games I rented over the years. So glad I found my old NES carts in my parent's basement and brought them back with me
Mario World / All Stars
Super Baseball Simulator 1.000
Mortal Kombat 2
Act Raiser 2
Final Fantasy 2 and 3
Wanderers from Ys
Stanley Cup Hockey
Zelda Link to the Past
Metroid Prime...this game takes me back to a time when I returned to console gaming in college. Every time I hear the menu music or something like the Phendrana Drifts music, the nostalgia hits me super hard.