Each of the unlockable cups are only unlocked in one engine class at a time. For example, if you unlock Star Cup in 50cc you will still have to unlock it in 150cc.

These ghosts are unlocked in Time Trial mode by obtaining a specific time on each course. The ghosts are those of the staff who made the game, and are all very difficult to overcome. The times given for each track are those of the Staff Ghost; the ability to race the Ghost is acquired by timing a few seconds more than the Staff Ghost on that track. It varies from track to track, though the required time is usually within 5 to 10 seconds of the Staff Ghost's time.

These ghosts are unlocked in Time Trial mode by obtaining a specific time on each course. The ghosts are those of the staff who made the game, and are all very difficult to overcome. The times given for each track are those of the Staff Ghost; the ability to race the Ghost is acquired by timing a few seconds more than the Staff Ghost on that track. It varies from track to track, though the required time is usually within 5 to 10 seconds of the Staff Ghost's time.

Different "Thank you for playing" screen after credits.

The staff ghosts have stars next to their nicknames when you see them on tracks. You can earn a star for yourself as well. It is only visible to other players in-game, but the star appears in your Records screen (Records button from the main menu) when you earn it.