Super Mario Bros 2 (aka The Lost Levels) (Famicom, 1986)

This was tricky to get working, but I did it. I've played the Super Mario All-Stars remake of this game (The Lost Levels) a number of times, but never the Famicom Disk System original. This...is going to be tough, but it should be interesting regardless. I find this game more fun than the original Super Mario Bros; it's also more accessible than ever since you can get it on the Wii or 3DS Virtual Consoles. Just be prepared for NES-style horizontal button mapping that can't be changed.

Mario's Fabled World 9

A while back, I took a look at Volume 52 of Nintendo Power, an issue which covered this game in-depth. There I learned that the game has a secret World 9 if you get through all eight standard worlds without using a warp zone. I'd never played the game without using warp zones, so World 9 was news to me and I had to check it out for myself.