Magic21 is a full-Firebase-managed mobile game. You can grasp how to create a real-time multiplayer game using only Firebase. Let’s read… — Hi, I’m Koya, a solo mobile game developer. I released Magic21, the realtime 2-players card game whose rule is based on blackjack in February 2020. It is a logical and strategic game but also you need your own luck and to read the opponent’s mind. It is available on App…