Mario & Luigi: Kola Kingdom Quest

Mario & Luigi: Kola Kingdom Quest is a reboot of Super Mario Bros. 5 Reborn. This 74-level hack uses many of the same tilesets and music tracks, and World themes, but contains completely redesigned levels and a new, much less blocky Overworld. It also features REAL HDMA gradients and custom Layer 3 images. Difficulty is probably comparable to the average Mario game. It starts out easy, but gets harder as the game progresses.

UPDATE 7-23-17: Fixed the level intros so that they no longer glitch out on hardware thanks to Ladida