We have released the following update today:
【New Feature】
・Quick View of Opponent Stone Colors During Matches
During a match, you can now press the X key to check the color on the underside of opponent stones.
※For gamepads, the corresponding buttons are:
Xbox controllers: RT,
PlayStation controllers: R2,
Nintendo controllers: ZR.

For details on past updates, please refer to the following page:
https://store.steampowered.com/news/app/3046460/view/783163573983510566
Upcoming Updates:
Totem usage restriction based on point difference
Support for parallel matchmaking
We are continuously exploring additional features to enhance your experience with Devil Reversi.
Thank you for your continued support!
— The Devil Reversi Development Team