I mean, for non-ecto kids to have a "complete" session is a matter of luck - prerequisites aren't many but you still need space, time, and possibly a damn vulcano. And final frog (you can find it anyway tho). So such players would have to pull off stunts to be able to win, really. Our kids tho, were limited by having to make LE happen - which is why they were doomed to "lose" at first.

Oh god I forgot that you need the fucking Last Frog to make a non-cancerous Universe. Sure you can win without it as we saw with Karkat and Kanaya, but you literally cannot make a healthy Universe if you’re not Jade- She saw the Frog. Not anyone else. In Hindsight we do know where it would be, but in-Universe? No one would think to look back into Earth, years in the past, in the middle of the Pacific Ocean, for a few seconds.