The Boost Update brings a *lot* of changes:
- Support for up to 8 players
- AI in Battle Mode
- New item in Race Mode: BOOST!
- New and refined race levels
- New characters
- Refined options menus
- New music
- Plus lots more including better color schemes, improved support for keyboard/mouse (though we still recommend using gamepads if you can!), and tons of bug fixes
See all the details at the Whatnotory blog!