Welcome to level 6471. You have 22 moves to clear all the licorice swirls, bring down all the Sprinks, and clear 30 color bombs. The color bomb dispensers give only 1 color bomb per move, so you have to make 8 color bombs yourself in the upper and lower portions of the board.
The only problem? This level has 4 colors. You are never making the 8 extra color bombs unless you have extra moves. The only way to win without ads, spending gold bars, or using boosters is to bring in extra moves with the win streak and a bunch of color bombs from the win streak and timed starting boosters.
This level actually used to have only 2 colors! Well, it also had bombs, an extra layer on the sugar coats, and only 20 moves; but at least it was possible:
(The level was originally at 6477. Now it's at 6471.)
Out of principle, I wasn't going to submit to King's whims. I wasn't going to bail myself out with the extra moves from ads. Armed with several minutes of infinite lives, I wanted to push the game to see where I could take it.
The first thing I noticed is that the game very slowly inches you toward victory. Every 10 or so attempts, you'll always start the level with an extra move. These extra moves will accumulate, so attempts 31-40 (approximately) will always start you with 3 extra moves. By the time I called it quits for the night, I was starting with 25 moves instead of 22. (I do not know if it goes past 3 extra moves; I stopped sometime in attempts 31-40.)
Second, my infinite lives expired sometime during this research. Having sunk over a dozen attempts into the level, I got this "Bonus Round" offer that was a lot better than the usual. Instead of a life refill (and maybe an extra booster? I forgot), it would have given me 30 minutes of infinite lives, some timed UFO access, and some timed lollipop hammer access.
Out of principle, I failed the level. I wasn't interested in chasing a full completion of the hard version of the Baker's Box when I had already beaten 30 levels tonight. During a few attempts, however, I noticed something peculiar: was the game trying to give me a lucky board every so often? On some attempts, there were almost no purple candies. I think this was the game trying to generate more cascades, but it didn't move the needle at all here. The board was far too cramped for it to matter.
Finally, I maxed out the number of extra moves I could pay for. Yes, it still includes a UFO every other attempt.
Welcome to the +255 Extra Moves club, I guess. And no, those extra moves from the ads would not have sufficed. There weren't any color bombs anywhere. Even with 25 starting moves, I was only able to make 1 color bomb myself. The timed color bomb bumped me up to 27 cleared. Remember: You're expected to make 8 color bombs yourself in 22 moves. You're not getting more than 1 or maybe 2 if you're insanely lucky.
Anyway, I spent the rest of the night completing gold chocolate box tasks. Please excuse me as I bang my head against the wall at having to use 2 party boosters when I already used the timed party boosters from the hard Baker's Box.
・・・
EDIT: I already posted something in the Support section regarding this level.
EDIT 2: I passed the level with the help of extra moves from ads. The second train gave me 20 minutes of jelly fish, 20 minutes of party popper, and 30 minutes of lollipop hammer. This made the ensuing elite Candy Royale a breeze.