How would I mathematically model this curve from Sonic the Hedgehog?

60 Views Asked by At

enter image description here

Hey guys!

I'm looking at the S-Curve from the first Sonic the Hedgehog game. Out of interest, I would like to know how to mathematically model this? I'm not sure, but I suspect that it may some sort of cubic? Any one know how to definitively figure this out?

Thanks!