Super Mario Star World

Layla: The Iris Missions is a complete overhaul of the Famicom game Layla. It features all-new levels, altered graphics, an original and much-expanded soundtrack, and many tweaks to game mechanics, with the goal of creating a more modern game experience without compromising the core grabbing-cake-and-ice-cream-on-roller-skates gameplay.

Mario has been arrested for a crime he didn't commit! Can you break out, and uncover a conspiracy along the way?

Super Mario 4 is a hack of the Game Boy game Crayon Shin Chan 4, originally by Bandai. It is a very common title on multicarts.

Sonic 2 XL is a hack of Sonic the Hedgehog 2 for the Sega Mega Drive by Captain Bozo and Ranger. Rings are replaced with onion rings, and Sonic becomes fatter after eating them.

Super Mario 14 is a hack of the Japan-exclusive Famicom title Kaiketsu Yanchamaru 3: Taiketsu! Zouringen, the second follow-up to Kid Niki: Radical Ninja.

Mario's Keep is a ROM hack/mod of Super Mario Bros. (NES). The game is a puzzle/maze, in which the player needs to find the floors and save the princess.

Super Mario Bros.: Two Players Hack is a ROM hack/mod of Super Mario Bros. which adds two players simultaneous gameplay to the original game.

Metal Sonic in Sonic the Hedgehog 2 swaps Sonic out for Metal Sonic from Sonic CD, you can choose between the Original moveset, Sonic CD, or the 2011 remaster moveset from Christian Whitehead's port of Sonic CD Metal will once show Robotnik he's not a bot to be forgotten...