I'm working my way through the mid range of the game which is seeing some horrible nightmarish levels. I find nightmarish levels worse than legendary ones as the outcome is so unpredictable and they can hold us up for a long time unless we get a lucky board. I have often suspected that playing a single party popper at the correct time will actually induce a lucky board, and here is some evidence. That's why I like to use this booster.
It's expensive to use, of course. But the algorithms like us to use it and it seems to be written into the level boards that if we use it early on then we will definitely pass the level. I have long suspected this.
Nightmarish level I have failed a few times. (The screenshot above is from a repeat attempt, just to illustrate what the opening board of this level looks like)
I had the 1 party popper gold chocolate box option, so using a party popper effectively gave me the gold I paid for it back, which is why I used it. The first two moves were useless, so I tried to see what would happen if I played the party popper early on, with 20 moves left.
So here I go: the game gives me a free double colour bomb combo just for playing the party popper. From the combo onwards it is obvious I will pass, so I play whatever moves I fancy and mostly those recommended by the game.
So this is nice evidence that playing the required boosters early on in a level will indeed INDUCE a lucky board. It may not be a party popper in all instances. Often a hand switch to bring two colour bombs together will achieve the same.