Mario 4: Kosmichyeskaya Odissyeya2011

Mario 3: Around the World is a unlicensed Mario game developed by BMB for the Sega Genesis.

Somari is a side-scrolling platform video game, originally released in 1994 for the Famicom. An unlicensed port of Sega's 1991 Sega Genesis game Sonic the Hedgehog, the game was sold primarily around Asia, Russia, and other regions where pirate NES cartridges were distributed. Like the original, players venture to defeat the mad scientist Doctor Robotnik, who plots to turn the animal population of the fictional South Island into evil robots. Unlike the original, the game features Nintendo's mascot Mario as the main character rather than Sonic. The title is a portmanteau of "Sonic" and "Mario".

A rom hack with just 1 level made for SMW Central's Chocolate Level Design 2010 contest.

Sequel to the first rom hack, The Second Reality Project, this new story brings a totally new villain to the franchise, Zycloboo (who is a Big Boo with one eye).

This hack is based on The Legend of Zelda: The Wind Waker, with references from other games of the franchise. Now go save Zelda once again!

An unlicensed NES game based on The Jungle Book.

Tonkachi Mario is a bootleg kaizo ROM hack of Super Mario Bros. made with Tonkachi Editor, an unlicensed code editor for the Famicom. It is currently the earliest known ROM hack of Super Mario Bros, alongside being the first hack of the kaizo genre, dating back to 1987.

Donkey Kong Country 4 is a pirated port of Donkey Kong Country from 1994 for the SNES, made by Hummer Team in 1997. The gameplay, graphics, and sound are similar to the official Game Boy Color port of Donkey Kong Country, albeit downgraded to work on the Famicom. It's often considered to be significantly superior to other pirates based on the Donkey Kong Country series.