Shrew Wave is Noise # 24.
These subterranean sneaks can appear anywhere. Watch their timing and whack 'em!
 Pin Drops
It is recommended that you keep an eye on these enemies, since they can hide underground, and their bombs can even hit Joshua in the air. However, any combo on the top screen is able to keep make it unable to attack provided it is the last enemy, and since it can only exist on one screen at a time, take it out on the top screen!