4-player Reversi

You can play a board game Reversi with 4 people!
The rules are the same as Reversi.It ’s the victory of the player who had the most stone.
You can play with people around the world online.
You can also play only with friends you know.
When you play with your friends, you can start the game without four people.In that case, the computer is automatically operated for the missing number of people.
* Completely free