This booster is basically a candy with a prize. Here's an example:
Striped candy- the "booster will spawn on a candy that will spawn ( Like the extra time candy it shows +5, perhaps a little stripped candy symbol on a candy will do, once matched, a random striped will appear
Wrapped- random candy with wrapped symbol
Also can be done with colourbomb
For this to happen the player must get the rewards by the following: (cascades)
Stripped- the voice "sweet" must be heard
Wrapped- the voice "delicious" must be heard
Colourbomb- the voice "divine" must be heard
Con of this "booster" is in 5 or 6 coloured levels, its harder to get the cascades
