(Saw this question asked on another popular link aggregation website and it got me thinking)
If you could play one game for the first time all over again, what would you choose? This might be because you want to do it all again, or because you don't think you got enough out of it the first time. It could be experiencing the game exactly as you were back then, or experiencing a game with what you know now.
For me, it's Legend of Zelda: A Link To The Past, experienced exactly as I was back in 1991.
Nothing comes close to how jaw-droppingly amazed I was by that opening sequence. The epic orchestral score, the cinematic rainstorm, creeping around in the dark... it was a generational leap above anything I'd played on 8-bit computers and consoles, and even the Megadrive. I'd love to play it again without thirty plus years of Nintendo/Zelda knowledge, or without knowing about the dark world.
I'm old enough to have been stunned by games like Cybernoid and Exolon (oooh, so many colours and sprites and explosions), Elite (damn, actual 3D wireframe spaceships!), Driller (wow, actual solid 3D at 0.5 frames per second!), Wolfenstein (actually playable 3D, with sprites), Doom (this changes everything), Quake (full 3D, nothing can improve on this), all the Half-Life franchise (you can also have a story to go with the shooting? who knew?), Portal, Portal 2 and The Talos Principle (puzzle games can have riveting stories) and finally Skyrim (damn, this thing is huuuge!). So yeah, I'm old. :-)