This hack does the following:

• Fixes character names and score board
• Recolors the title background yellow, to be more accurate to Super Mario Kart.
• Corrects the error where Mario had a green hat and Luigi had a red hat.
• Slightly improves character palettes - Mario/Luigi often had a half-white face and Peach had very dark brown hair, these have both been recolored to be more accurate.
• Improves palettes for duplicate characters (for example, if two people pick Mario, player 2 now has the color scheme of Wario)

There is still plenty of room for improvement:

• Luigi’s special moves cannot be executed by a human player,
• Bowser moves far too slow, making him totally non-viable,
• Mario/Bowser should have their home stages swapped (Mario’s home being a lava stage is strange),
• The music on Peach’s stage (Clouds) could have its volume slightly reduced as it’s obnoxiously loud,
• You shouldn’t have to fight Bowser twice,
• “The End” should show up on all difficulties,
• You shouldn’t be penalized for a perfect,

…and there’s almost certainly more.

This hack is intended for a clean “Kart Fighter (Unl)” ROM, with a CRC32 of 4877213A.

• Database match: Kart Fighter (Unl).nes
• Database: No-Intro: Nintendo Entertainment System (v. 20180803-121122)
• File SHA-1: EBF39B0E6EC4B8D5FC0C7715BB88C9E733018D89
• File CRC32: 4877213A
• ROM SHA-1: 19119E04C7542CD294A5B34844F0D4578E211DF8
• ROM CRC32: 6C15609F