Score! Achievement - How do I get x8 Multiplayer?

[marekzegarek07]

I have unlocked all achievements besides this one. I don't know for what I earn multiplayer. Can someone help me with that?
Cheers

[ScytheRider]

To get multipliers, you need to shoot as many balls as possible to not break your shot streak, and don't let any ladybugs get crushed from behind by balls.

Just play the first boss level, keep shooting spinners so the boss doesn't attack, and build a large shot streak by shooting the passing balls. You'll get the 8x multiplier after a while.