Try the Gamefaqs version. For some reason, the one here is missing a few things. The one at Gamefaqs that is the same as here is made by Rams, aka Strider

i've got to the Secret Tower and i'm on the second floor. i cant manage to get past the third set of cracks. the walkthrough on the site doesnt say how to get past them. i know i need at least two spaces from the cracks to have enough momentum to go past them, but there are only two spaces there.... so waht do i do now?

weee... use the fast bike nuff said.