[From the container back]
For use with the Professor Brainstorm Word Challenge and Equation Invasion Card Games.
Hydra, the Sea Kingdom, is a nautilus shell shaped city constantly traveling throughout the World of Aura via swift underwater currents generated by an immense hurricane.
You may also use this as a Map when exploring the World of Aura if you are unable to ask a Mermaid for directions.
[Personal summary]
This is a high quality play mat, made of laminated card stock, compared to the paper play mat that comes with the game decks.
On the front is the play mat for card play, with background art in the style of Hydra. The back has a map and written description of Hydra. The map is designed to be placed with the play mats from the other three kingdoms to show the whole World of Aura.