As a kid, the only games I had for the original Gameboy were Pokemon Red, Blue, Yellow, and Silver, Donkey Kong Land, Tetris, and Harvest Moon 2. Out of all of those, I enjoyed Pokemon the most; in fact, I got so frustrated and pissed off with Donkey Kong Land that I threw it across the room while playing it one night and I haven't seen it for almost 20 years. It's probably still in a container of random action figures or something.
Guess I was never that big on the Gameboy, since even now, my library for it consists of those games and three more that I only recently acquired. I love the size of the boxes and the design of the cartridges, but I guess the original Gameboy's library was never that appealing to me. Gonna have to just go with Pokemon, I suppose.