I've been trying to figure out how to get the different balloon bonus rounds in each audiostrike stage, and for now it seems as though it is random, or when I do well on a stage but I can't seen to reproduce the behaviour.
Does anyone know any hints on how to obtain the bonus rounds?
I know that in stage 3 for example, 3 1, if you destroy one wall you get the bonus round.
2.4 the boss mouse weapon thing, if you destroy it quickly maybe?
But sometimes I don't get it.
Stage 1 1, I think maybe if you destroy a lot of ships?