Replaying a lot of old favorites: Mario Bros. series for NES and the Sonic series for Genesis. Picked up Taz Mania @ a flea market this weekend, so I've been playing that too!
NES~SNES~Genesis+32X~SegaCD~Atari Jaguar~N64~Saturn~PS1~Dreamcast~Game Cube~PS2~Wii~XBox 360~XBox One
Currently Playing: The Legend of Zelda: A Link to the Past (SNES), Lord of the Rings: The Third Age (GameCube)
Rayman on the Game Boy Color. Very awesome indeed. Similar to the console version: same types of environments, and mostly the same enemies, but completely different levels. Very fun to play, and almost just as challenging.
One thing I've noticed though. I'm halfway through the game and there hasn't been a single boss fight yet.
Currently addicted to Terraria. Did I mention it's addicting? It's kinda like making a nest in Sim-Ant but it's an action RPG with Minecraft-(never played it)-like terraforming and MMO like resource gathering and item crafting. It also offers online PVP battling and co-op play. It's incredibly well built and balanced, and the boss battles are long and epic. It's also incredibly cheap! Give it a try, you won't regret it.
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Terraria: Shut up and dig gaiden!
Terraria: Sand is overpowered.