you need peak ranks to unlock the bonus worlds though
7 days ago(-1)
technically, but you would have to get a swag on every level in order to get the required 375 points for the bonus world
7 days ago(+1)
Peaks for sure help you towards reaching the prism threshold. But that threshold is ultimately based on getting swag on all prior levels, so you can think of any peak you manage to get as a bit of leeway to get a lower rank on another level you have more trouble with. You don't need to get all peaks, so don't feel bad about skipping peaks on the levels it's too tricky on.