I know exactly what you want, if you people have ever played sonic, you would know what he wants, i mean how the heck have you people not played sonic!!!! gezz, anyways, i also have no idea how its done :P BUT, hmm.. saw this link else where, and looks to be the physics you need or related to. check out all the other kewl physics demos, and explinations and ect ect, demos, now try and re-write it in blitz :P
http://www.myphysicslab.com/RollerSimple.html now on this page you will see at the bottom, other examples, like hump, loop, circle, infinity, oval, spiral, .... well click on the Loop picture, that looks like what you would need or something like it.
main page. http://www.myphysicslab.com/
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