The green-screened, toaster-like handheld that shambled onward against all reason. I'm sure many of us still love it, if not for the stellar invention of portable Tetris alone. It has of course been trounced by it's sleeker spawn, but the Game Boy was.. important.
For me, the Game Boy marked my financial entry into gaming hardware ownership.. the innocent age when $100 seemed like an outlandish amount of money. I'd been obsessed with the Game Boy for quite a while previous to finally saving up the money to buy one, and it was Link's Awakening that really inspired me to put aside the allowance. That game just looked incredible.. and it really didn't disappoint. I have some very fond memories of frolicking about on Koholint Island.
There are many other Game Boy games I absolutely love, and being able to play them on a handheld as fantastic as a GBA SP really is a pleasure.
Just off the top of the ol' head..
Castlevania II: Belmont's Revenge ... hot damn, that's one slow Belmont trot, but what a fun game, and some of the best Game Boy music ever.
Daedalian Opus ... I liked this game so much that in school I used to draw out my own little Daedalian Opus puzzles and try to solve them. Whoohoo...
Donkey Kong ... there's so much game here it shocks me.
Elevator Action ... not a classic, but I seriously dug NES Elevator Action back in the day, and with the extra weapons of Game Boy Elevator Action, life is indeed good.
Final Fantasy Legend II ... one hell of an epic RPG quest. There's a lot of uniqueness to the character classes, and it's overall a finer package than the two other Legends.
Gargoyle's Quest ... Firebrand's one cool dude, and while Gargoyle's Quest 2 and especially Demon's Crest vastly improved upon this one, Gargoyle's Quest is still a very fun, if admittedly short, action-adventre romp.
Legend of Zelda: Link's Awakening ... I really dig the feel of this game, not to mention how smoothly the Zelda experience was translated to the Game Boy.
Metroid II: Return of Samus ... were this given the Zero Mission treatment, I think many more people would love it.
Qix ... the portableness makes it tops.
Quarth ... not the deepest of games, and in fact repetition and monotony will set in with extended game play, but as puzzle games go, it's unique.
Super Mario Land 2: 6 Golden Coins ... a fantastic, fairly enormous platformer.
Tetris ... obviously.
So what does, or did, the Game Boy mean to you? What are some games among its library that stand out in memory, be they fabulous examples of what can be done on a handheld, or abyssmal reminders of the horrors born of hardware limitations?