Creative

Sandbox is the first, only, and most basic game mode available at this point in time. It has no goals and you are unable to accumulate resources, thus all blocks are free.

There is no end, nor objective to Sandbox; it simply gives the player the ability to build freely without limitations. The sandbox map is randomly generated, with a range of and hidden ores. In this mode, said ore has no purpose, whereas it is planned that they will serve a monetary purpose in future Game Modes

Although there are no naturally spawning NPCs, you are still capable of spawning them in single player with the 'G' key. Unlike other planned modes you cannot die in Sandbox.