CityCraft.io

City Craft.io is yet another online game thats trying to look like Minecraft. Its a very simple version where you can build up your creations using blocks. The blocks don't have any textures and are made from a single color. You can still create some interesting combinations, though. Since its a multiplayer game, you can send your coordinates to a friend and he can join you. In the other case, you will probably get bored after some time. don't forget that you can fly in the game.