Yeah, the flute song to warp into Big Bunny room isn't accessible in the game, as far as I am aware. It was data mined, I think .

P.S. The threads under guides are reversed (new comments are on top), which confused me.

The flute song is technically findable in-game. However, it requires abusing glitches to go inside of the "Snail Island" , where there's a chest with a "Cheater's Ring" item (it was known as "Magic Ring" in alpha version of the game).

With the "Cheater's Ring", it is possible to go through walls. One secret room, inaccessible through normal means, contains the warp song for the Flame monuments room on the wall texture .

https://www.youtube.com/watch?v=LyA2lA8LGBY

oh i cant edit. anyway this is the crazy way i saw. its spoilery so be warned. but if you just want it. at least as of today, it works.

i found a very easy method using two warp codes off a video. the bubble method was fine. just failing it was yaaay. but the codes are late game so its very cheaty feeling. still was happy to nab that one. the tech to do it involved using the remote, frizbie and flute. interesting strat. made it too easy. but yurr.

@andrybak That method is very difficult to pull off consistently.

Anyway, about a week ago someone posted a method that blows all others out of the water (though it's a bit spoiler-ish of a very secret place).
https://www.youtube.com/watch?v=LyA2lA8LGBY

Which kind of shoes do you have, FRru? This route is much simpler:

https://www.youtube.com/watch?v=RWnnGwj1bsA

Why? Because it requires zero bubbles. This was important for me, because the noob I am, I didn't learn the bubblejump on the first playthrough. I got to 15 bunnies without bubblejump.

The hardest part in this route is at the last switchable door/blocks, because it requires three quick button presses in a row (jump+use remote+use remote). All other jumps require only two quick buttons in a row (jump+use disc or jump+use remote).

nvm i got it thank you so much bro. much love

i'm ngl i suck ass at platformers so i'm just wondering if there's a way to save your game at any point through this?

@DeadricRat just because it's not on some wall somewhere doesn't mean it's not findable. I think the dev put it there and left it there for it to be found, whether it's hinted at somewhere or if it's just found by brute force. I mean, the reason we know it at all is because somebody did find it.