I didn't seem to find any of the challenge dungeons yet... Are they even in game?
I finished Ceodore, Palom's and Porom's story.
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Sign up to join this communityNo. On the iOS version various things are missing. This includes the challenge dungeons. Other things that are missing are the extensive dungeon in the final chapter and Proto-Babil.
I think there is no challenge dungeon. The entrance is not there on Ceodore's story. There is no Namingway changing his name to Challengingway.
Not from what I've seen unfortunately. Just finished the Lunarian mission and there's no namingway dude there either.