Can I make a small scale hack and slash?

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Hello!
I'm working on a hack and slash multiplayer game. I read a lot so I know I can't make MMO with Photon Cloud so I came up with idea to make the server browser and each server will actually be a room. So my question is: is it possible to make this kind of system for min 100 players in each room or max 1000? If it's important it's a 2D game.
Thank you for help!