Portal - 9/10
Fun, challenging, and head-scratching at times. Only flaws are how short it is and how easy the final boss is, even on the first playthrough.
Super Mario Land: 8.5/10
If you are a fan of Mario, 2D platformers, or just gameboy games, this one is essential. And its not hard either. I've completed it in under 20 minutes with no deaths easily and beaten it at least 15-20 times. Its even better than the sequel in my humble opinion (I know...
Super Mario Advance 4
8.5/10
Definitely the best looking and playing version of Mario Bros. 3. I would highly recommend it to anyone who enjoys a medium-difficulty 2-D mario platformer or who just wants to expand their GBA library.