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These are all marked in the cheats section as being exclusive to the European/Japanese versions of the game
I get it now, it becomes pretty obvious now that they have content the USA version does not have.
copied from the cheats sections:
* Endless Dristone Driller Level (JP/EU Versions) Beat Dristone Driller once to unlock Tokyo being an infinitely deep level. How to Unlock endless modes (EU/JP Versions)
Unlockable How to Unlock Outer Space Complete "The Moon" in mission mode South Pole Complete all earth levels in mission mode
Unlock Usagi (JPN/EU versions) To unlock Usagi you need to complete the 2000m moon level in mission mode using Ataru. Please note this only works in the Japanese and European versions.
I noted the possibility that these are just the same modes/levels the USA version has but with different names. But Usagi is extremely strong evidence to the contrary. (as I think I would have noticed unlocking a SEVENTH CHARACTER !!)