Heya!
So been thinking about three categories that would be swell to have on the leaderboard.

First one is the Snake RnR equivalent to 100%, 'All Pickups & Feet' where one collects all powerups (1-Ups (invisible, visible and the ones from feet), Clocks, Tongue Extentions, Continues, Speed, Invincibility and Control Reversers) and defeats all feet! Here is a sort of okay run of it I made to start off with. youtu .be/f9beIcJcJhA <-added a space between youtu and .be to remove the preview, consider it my submission to the category!

Second one is Any% Co-op, which is Any% but you play it with two players. Dunno what other thinks (discussion is welcome) but I'd say one player is allowed to be on submissions with many runners, for example if I do one run with 1 friend and then 3 months later find another partner we can submit our run and the first run would still be allowed to stay on the leaderboard.

The third one is Warpless Co-op and is like Any% except you don't use any warps.

The rules tab in All Pickups & Feet could be
"Collect all pickups (1-Ups (invisible, visible and the ones from feet), Clocks, Tongue Extentions, Continues, Speed, Invincibility and Control Reversers).
Destroy every foot.
Warps are not allowed.

Timer starts when beginning the game from the title screen.
Timer ends when the snake enters the flying saucer.

Rules for Any% Co-op could be
"Play in 2 Player mode.
Warps are allowed.

Timer starts when beginning the game from the title screen.
Timer ends when the snake enters the flying saucer."

Rules for Warpless Co-op could be
"Play in 2 Player mode.
Warps are not allowed.

Timer starts when beginning the game from the title screen.
Timer ends when the snake enters the flying saucer."

Hey there Daniel, awesome work in the rattles n' rolls!

As for adding a bunch of misc. categories I think it's best to leave it as it is. When boards end up with too many small time or memeish categories it gets too cluttered and isn't necessary. I would never discourage an individual from running a fun challenge category however! There just needs to be more of a community and want for any extended categories like these. I appreciate your love for this game, it deserves more love honestly.

These could be very fun challenges to do, but I agree with Toad at this point. I might be looking into this and challenge myself personally. Very good suggestions though!