27 - Yoshi's Island (Guessed by TruckOSauros)
Yoshi's Island was one of my first games played, which I owned. I played it on both SNES and the GBA. It was definately quite a treat and was one of the more different experiences I've had with 2D platformers. The game was just outstanding and had great art. It made me like the genre a bit more, as I've never actually been the biggest fan of it. Nothing much more to say, it's not the highest 2D platformer on my list, there are two more, but this one packed a punch.
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3DS Friend Code: 4553 - 9954 - 4854. Name - David