Donkey Kong II: Jumpman Returns

Donkey Kong II: Jumpman Returns is a Romhack create by Jeff Kulczycki of ROM Hack created in 2006. Adding the DK2 chipset allows you to switch from original Donkey Kong to DK2 via pressing both Player Start buttons followed by the Jump button.

The modded game offers a total of 8 levels. This includes the original 4 levels, with a few minor (clever) updates, and 4 new levels: Mixer, Foundry, Refinery, and Incinerator. I love the chip-swap implementation making this upgrade fairly easy for most owners. But what astounds me most is the visual integration of the 4 new levels!