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Hi @johamilton
Rainbow Rush helps in clearing a specified colour of bubbles (e.g. red, blocker that counts as a coloured bubble, etc.) and it was my favourite booster depending on my strategy.
Shooting Star was my favourite to use, obviously used to clear a specified bubble but it is also used to detect colored bubbles while fogged.
Magic Beam is also my favourite, even though Charlie the Ghost was stuck in surrounding bubbles. This was so great to use for Ghost levels to zap a tunnel route.