Dig, fight, explore, build! Nothing is impossible in this action-packed adventure game. The world is your canvas and the ground itself is your paint.
Terraria is noted for its similarity to Minecraft and classic exploration/adventure titles such as Metroid and Spelunky. Basic gameplay features day/night cycles, aggressive nocturnal attackers such as zombies and floating eyeballs, world-building elements and character advancement based on increases to health/mana and equipment found while exploring. The game has a tile-based graphical style reminiscent of the 16-bit sprites found in video games released for the SNES.
At the start of the game, players have a copper axe, a copper pickaxe, and a copper shortsword. The game features exploration, crafting, building structures and combat with a variety of creatures such as zombies and demon eyes, who will constantly attack the player until morning. At dawn, they all run away, even if they are still attacking the player.
Players may also summon powerful boss monsters, such as the Eye of Cthulhu and the Eater of Worlds. Independently of summoned bosses, each map contains one dungeon that contains rare items and unusual enemies, and can only be safely entered after first defeating the Skeletron boss on that map. If one attempts to enter before defeating Skeletron, they will be quickly killed by a skeletal head that deals around 9999 damage to the player on contact.
The developers plan to offer free content updates in the future.