Super Mario 6.4 (unreleased Game Boy game)

In order to compete with Sonic Blast on the Game Gear, Nintendo of Japan ordered TechEruo to make a handheld port of Super Mario 64 for the Game Boy called Super Mario 6.4, this would feature birds-eye psuedo 3-D graphics, similar to ones used for Faceball 2000, but with a third-person perspective. The game was never released, but it was leaked online in 2000.

Differences

 * The save system has been replaced with a password system.
 * Lethal Lava Land's music is the music for Bowser in the Sky.

Bobomb Battlefield

 * #1 - Big Bobomb on the Summit
 * #2 - Footrace with Koopa the Quick
 * #3 - Shoot to the Island in the Sky
 * #4 - Find the Eight Red Coins
 * #5 - Behind Chain Chomps Gate

Whomps Fortress

 * #6 - Chip Off Whomps Block
 * #7 - To the Top of the Fortress
 * #8 - Shoot into the Wild Blue
 * #9 - Red Coins on the Floating Isle
 * #10 - Blast Away The Wall

Cool Cool Mountain

 * #11 - Little Penguin Lost
 * #12 - Frosty Climb For Eight Red Coins
 * #13 - Snowman Lost His Head
 * #14 - Wall Kicks Will Work
 * #15 - Scale The Mountain

Lethal Lava Land

 * #16 - Boil The Big Bully
 * #17 - Bully The Bullies
 * #18 - Eight Coin Puzzle With Fifteen Pieces
 * #19 - Red Hot Log Rolling
 * #20 - Hot Foot Into The Secret Cave

Snowman Land

 * #21 - Snowmans Big Head
 * #22 - Chill With The Bully
 * #23 - In The Deep Freeze
 * #24 - Whirl From The Freezing Pond
 * #25 - Shell Shredding For Red Coins

Bowser in the Sky

 * #26 - Bowser Battle

Secret Stars

 * #👑1 - Toad Star One
 * #👑2 - Toad Star Two
 * #👑3 - Toad Star Three
 * #👑4 - Mips The Rabbit One
 * #👑5 - Mips The Rabbit Two
 * #👑6 - Behind Peachs Window

Trivia

 * Despite the planned boxart having the wing cap, you could not use it in game, and is not even displayed in the ending.