Make Nintendo Event Exclusive Dungeons Available

[an8bitbatty]

I noticed there were several functioning Dungeons that were unavailable without a special Wondermail Code to unlock each of them, if there is any way to edit the Unlock Criteria for Dungeons, or at least the Event Exclusive ones, it would be a good addition to the features, thanks!💚
Also, here's a list of the Nintendo Event Exclusive Dungeons for reference:

Oddity Cave
Remains Island
Marvellous Sea
Fantasy Strait