Deadpool_X
Banned
Probably Mario + Duck Hunt on Nes.
I guess... since it's my first boxed video game (not on Apple but on Thomson). Though I wouldn't take bets on the floppy still working fine.
The oldest one I've tried recently is Burnin' Rubber on Gx4000 and Tetris on Gameboy (my first cart games)
Unless you count pong consoles / Game & Watch...
Ocarina of Time for the N64. I don't even have the N64 anymore. Sold it along with all my other games for it earlier this year. But I just couldn't bring myself to part with that one cartridge.