World 3-6: Mushroom Madness 2

http://www.kongregate.com/games/KingDotCom/mushroom-madness-2

World 3-5: The Binding of Isaac

Beat Mom for the first time, but seasoned players will know that this is far from the end of the game. I have since gone on to complete the full game many, many times since this moment.

World 3-4: Abobo's Big Adventure

Abobo's Big Adventure website

World 3-3: Bullet Bill 3

Bullet Bill 3 by Psycosis91

World 3-2: Donkey Kong Country

World 3-1: Mega Man X2

World 2-100, The Final Boss: StarCraft

Review Pending