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 to Sandbox, as its primary point is simply giving the player the ability to build freely without any limitations. Ore still spawns in Sandbox maps, but has no purpose; all blocks follow the same rules as they would in any other map.

Although there are no naturally spawning NPCs, you are still capable of spawning them in single player with the default G key. Unlike other modes you are unable to die in Sandbox.