So the problem is there any Minecraft like game that is free so we can play as long as we like ? well, the answer is yes. There are so many free Minecraft game if you want to search for it. One of them is Terasology, this game is much like Minecraft !, but with more awesome graphics, say no more block-shaped clouds, block-shaped sun, flat shader, etc etc. In this game you will find a whole new graphics with a beautiful scenery blocks !. Here is one of the screenshot from the game:
So This Terasology is a Project that Strated by Benjamin "belga" Glatzel, in the early time this project was intended to research procedural terrain generation and efficient rendering techniques in Java by using the LWJGL. This game using block-based voxel engine as you see in Minecraft. This game also a tribute for Minecraft so because of that it looks like Minecraft, but don't think it's full of Minecraft things on the game, this game have its own niche by aiming for the NPC-helper and caretaker focus from such games as Dwarf Fortress and Dungeon Keeper, so its different from Minecraft, here are some video for the game play !
As you can see in the video the game is worth to try, if you want to download the game you can download it from here: