Donkey Kong Country Flash is a hack of SMF2 made by TheRussian, based on the Donkey Kong Country series (SNES). It uses revolutionary shape-editing to create tiles with upper parts that appear behind the main character, creating the illusion of Donkey Kong standing on 3D ground. It also has the 1-player game disabled, because it looked so terrible.
Donkey Kong Country Flash is notoriously one of the hardest hacks to use due to how big everything appears in the editor. It is considered a great technical demonstration if anything.