Super Mario 64 Plus

Changes

 * Rumble features were added
 * BLJ patched out
 * "So long, King bowser" was changed to "Buh-bye" due to the localizers mishearing it as "So long, Gay bowser"
 * Luigi mode added
 * After you beat the game, you can return to the title screen, and Luigi mode has been unlocked.

Luigi Mode

 * Luigi jumps higher
 * Bob-omb Battlefield is now a fall stage
 * Luigi uses pitched up Mario voice clips
 * Several Whomp's Fortress areas were modified to suit Luigi's higher jumps
 * You only have half of the HP meter at start, although you can refill it to full with coins.

Trivia

 * This was originally planned to release Christmas 1996, but due to production issues, was pushed to Christmas 1997.