Outer Space level
Unlock all the characters in the regular stages, then complete mission mode to unlock the Outer Space level, which has an endless depth.

Play as Puchi
Successfully complete the Japan level in mission driller mode to unlock Puchi.

Mirror time attack mode
Successfully complete levels A through J in time attack mode to unlock mirror time attack mode.

Play as Usagi (Japanese version)
Unlock all characters, then successfully complete the 2000m Moon level again with Ataru. A black rabbit (Usagi) will appear on the top screen. Successfully complete the stage to unlock Usagi as the middle character on the selection screen.

Mr. Driller Badge
Successfully complete a Mission Driller mode level without using any items or losing a life. Note: The Outer Space level does not have a badge since it is endless.