It's Critter Time!

Out of sheer coincidence, I picked up a copy of Namco Museum Volume 3 for PS1 last week. I've been able to figure out the first three floors, but floor 4 is stumping me. I remember Namco Museum DS saying something about using the mattock to trigger its treasure, but I'm stumped on how exactly the ...

I wasn't SUPER active there, but it was a frequent haunt of mine and I'm still sad to have seen it go.

More than anything else I'm mad that I never got an eggbug plush.