Mortal Kombat 2 Unlimited
This hack adds many extra features to the original "Mortal Kombat 2" game and unlocks all the game's available content. You can play as the bosses and the secret characters Smoke, Noob Saibot and Jade. The hack changes the character select screen and the main menu, and adds new sounds. In addition, you can use "Endurance" and "Practice" modes, which are not present on the original games. The hack also brings across music and stages from the original "Mortal Kombat" game. The hack also adds "Brutalities" to the possible finishing moves and cleans up many minor glitches from the original game.
Ultimate Mortal Kombat 3
The "Ultimate Mortal Kombat 3" hack gives the old game a thorough overhaul. It adds new characters, stages and sounds, as well as unlocking characters and new types of fatalities. This hack is very extensive, and the "Select Your Fighter" screen is proof enough -- there are 58 characters to choose from. "Mortal Kombat 3" had plenty of characters in the original version, but nothing like what the hack does. It also improves the quality of the AI, which refreshes the playability and makes you look for new strategies.
Ultimate Mortal Kombat 4
The "Ultimate Mortal Kombat 4" hack drastically changes the game. The characters have new costumes and names, and there are many humorous new courses, such as the "Jiggly Room," which features multicolored lights on the floor, like a 1970s disco. There is so much changed that it seems like an entirely new game. The basic gameplay is still the same, but this hack changes a lot superficially about the game. In addition, there are new fatalities and new modes. The new characters are different from the original ones and have names like Cyber Lizard and Bob.