I'm gifting my friend's child a handheld emulator and loading it up with games. It's capable of playing things pretty much up to Nintendo GameCube (It's even running Twilight Princess, though it studders in some areas).
I've got pretty much everything that exists for NES, SNES, N64, as well as a couple dozen games for Genesis. I never had a Sega Saturn or a PS / PS2 growing up though and I'm wondering what I should grab for those, as well as some more obscure GameCube titles if there are any I should know about.
Here's your chance to wax nostalgic about some old games and help ensure they make it into a kid's present. Even if I have the game already, I can still throw suggestions into the "favorites" list and make them easier to find.
Even the original GB had bangers, like Donkey Kong '94
The original Pokemon R/B/Y games were technically GB games, even though Yellow did do some colors if you played it on a GBC. Metroid 2 was also a GB game.
Link's Awakening, too, but the DX version was a little better
Edit: Totally forgot about Kaeru no tame no Kane wo Naru "For the Frog the Bell Tolls" - it's a strange Japan-only GB game that's roughly a more puzzle based Link's Awakening. There's a fan translation out for it.