Harder Game
For a greater challenge, press C ten times before selecting the Options screen. Now when you select the Options screen, there will be a new difficulty level called "Hyper." You will be able to accelerate faster if you choose this option!
More Options
From the title screen, press Start, then press A eleven times, B three times, and C eight times. The Options menu will be renamed "Hyper Options" and have some new items, including a level select.