Occupy White Walls is a virtual gallery MMO. You're supposed to slowly build up your own gallery, employing improbable architecture and the help of an AI that learns what art you like. I don't do that. I spend all my time hopping into other people's galleries instead, never knowing what's around the next art corner.
That's what OWW is, for me. A portal into other people's dreamscapes. It works because of how varied the galleries can be, with people pursuing wildly different tones. I might spend a few minutes wandering through a sunlit statue garden, then leap into a cavernous disco hall. I'll squeeze through darkened corridors, then teleport to a neon-flooded podium. Even the scanty, neglected galleries are interesting. You get to figure out whatever ambitious architectural project someone was going for, and empathise with their giving up.
It's also an admirable attempt to democratise art, as Emilie Reed explores here with (ironically) far more expertise than I can.
All of this is free. Go on, have a wander.