I've noticed that some cave icons on my map have checkmarks next to them while others don't. What does the checkmark symbol mean?
26No, for those wondering, it does not mean the caves are paying $8/mo to be "verified" :P– scohe001May 16 at 13:47
In a similar vein as the treasure chest icon on shrines, a checkmark will appear on the cave if you've found the cave's Bubbulfrog and recovered its Bubbul Gem:
Like in the case of shrine chests, this implies that every cave will contain a Bubbulfrog. Keep an eye on the ceilings until you find it!
The caves on the starting Great Sky Island are an exception. They don't contain Bubbulfrogs, but all of them have a checkmark on my map. May 24 at 18:56
@Stevoisiak I wonder if that's Great Sky Island-specific or if it's because Bubbulfrogs only live on the surface, so NO sky island caves will have them (I personally haven't encountered caves anywhere but Great Sky Island to confirm or deny this difference)– scohe001May 24 at 19:57