I play on mobile only. Used to be able to go back and play early levels to get the max boosters to beat harder levels. Even then it wasn't easy to win some for long stretches but now i get stuck for MUCH Longer
The only way I was able to get the score requirement was to use two color bombs separately. Thanks! I finally got it using a multitude of combos but i "beat" the level at least 10 times before finally getting a high enough score to move on.
Same thing happened to me. I was able to beat on my phone even with the lower bomb count eventually, combos and more combos were all I could do to raise my score to meet the requirement.