Terraria is an action-adventure game similar to Minecraft that allows players to explore a procedurally generated 2D world, gather resources, craft items, and build structures. The game was originally launched in 2011 for PC and other platforms. It has since been ported over to a variety of different devices including mobile phones and gaming consoles. You can explore the world at your leisure while battling enemies like zombies and skeletons to gather resources like wood, stone bricks etc so that you can build structures such as houses or underground mines where you can find rare items hidden deep underground.