The Steam version of "Super Ancient Weapon Holly" has a major update! Extreme Challenge mode for deeper layers has been implemented.

The Steam version of "Super Ancient Weapon Holly" has a major update! Extreme Challenge mode for deeper layers has been implemented.
Aniplex has released an update to the Steam version of "Ultra Ancient Weapon Holly" today, May 17, adding an "Extreme Challenge Mode"....

The linked article is in Japanese.