Mystery Bubbles are marked with a question because noone can now what you'll get from it before you get a direct hit at it. A Mystery Bubble can change into a Black Bubbles, into Bubbles to shoot in the Cauldron, into an Infected Bubble and many more things! Tell us what kind of surprises you have got from your Mystery Bubbles! Mystery Bubbles are introduced at level 146 in the Game Bubble Witch Saga. Mystery Bubbles can also be found at level 148 and level 149. Here you can have a sneak peak at the Mystery Bubbles in action!
In this video the Mystery Bubble turns into a Rainbow Bubbles!!!