- "These subterranean sneaks can appear anywhere. Watch their timing and whack 'em!"
- — Noise Report
- Tunnel Dweller: The Shrew Wave is able to move between the top- and bottom-screens at will via holes in the ground. However, it can only attack when it is protruding from one of these holes; if forced out by attacks, the shrew Noise will try to crawl over to one of its burrows to resume its attacks.
- Claw Slash: The Shrew Wave pops its head out of one of its holes to perform a double-clawed downwards slash on the player if he's nearby.
- Shrew Bomb: The Shrew Wave pops its head out of one of its holes and drops a bomb just outside the hole. After 3 seconds, the bomb will explode, causing serious damage within a certain radius.
Shrew Waves can only be harmed while at least partly above the ground; even Fusion Attacks will miss while they are underground. Attacks with knock-back can force these Noise out of their burrows until they can crawl back into one of their holes, leaving them extremely vulnerable to attack. Dash or use a well-timed block to avoid taking damage from their bombs.