An MMO openly based on Minecraft
You can choose from over twenty different skins for your character, so you can set yourself apart from all the other inhabitants of the cube planet. In any case, each player will have their name hovering over their head.
Just like on Minecraft, players can pick up blocks on the scene and create buildings or other structures with them. On this multiplayer version, original blocks regenerate themselves every so often, thus ensuring that you will always have more blocks to use.
Just like on any other MMO, players can talks to other players that are connected to the server at the same time. You simply need to write a message on the chat in order to communicate with the other characters.
Planet of Cubes is a different game that, even though does not offer a specific adventure or objective, does allow you to enjoy an open multiplayer world in which to let your imagination run free.