Slaz's levels exist in a peculiar intersection of being incredibly specific to JJ2 mechanics while also not specific to traditional JJ2 level design. There are so many events that this level is built around that couldn't easily be substituted, and yet, this is not at all how the normal levels play. V-Poles, one of my favorites, are used frequently to help the player get around. Pickups are simultaneously numerous and infrequent, often placed singly instead of in groups or four or six. Some food pickups are used to mark where players should jump and so on, classic platformer design goodness, while many more are just incidental to keep the player engaged and the screen busy. Secrets are absolutely everywhere but do a good job of being clearly secrets, not the main path, except for the exit from the dark grave area, which is kind of confusing. Collapse scenery is used to great effect in an all-new(?) way to open up the level as you progress through it: there will be multiple horizontal areas built on top of each other, and once you find the way up to the next one, you can trigger collapse scenery to open up more paths for easier exploration later. Sometimes this is paired with buttstomp scenery, which I think works less well because the stomp blocks are much easier to see than the collapsible bridges, and that makes it look like something you're supposed to uppercut. Things that look like they can be shot can generally be shot. There's just an endless variety of things to do, in a variety of possible orders to do them in, letting players take control of their destinies and craft their unique gameplay experiences. But somehow this non-linear experience manages to be crossed with an ultimately linear level with three or four distinct, bounded areas with their own objectives and layouts. It's an impressive balancing act, the moreso for how natural (but rewarding) everything feels.