The defeat of some bosses is directly tied to in-game progression, while others remain optional. Bosses are summoned by using certain items or when certain criteria are met. Players may also battle bosses that utilize a number of different combat mechanics and can drop rare and valuable items. The game features an open-ended class system, primarily divided into melee, ranged, magic and summoner classes. Players can encounter many different types of enemies in Terraria, the occurrence of which depends on several factors including time, location, and random events. Much like most Terraria items, armor and accessories can be crafted, found around the world, and obtained from defeating bosses. Characters have three inventory slots for armor to be equipped, and several inventory slots for various accessories to provide a boost to a player's statistics, such as wings or water walking boots, as well as vanity slots for all of them, allowing them to be hidden behind cosmetics while retaining their effects. Along with that, players can obtain vanity items, which are special armor pieces and accessories with only a cosmetic effect, and dyes to change the color of equipped armor or accessories. Players have the option to customize their character's appearance when creating a new character, and in-game by visiting the Stylist NPC or the Clothier NPC. Several items in Terraria create complex crafting trees involving a large amount of items to create a single powerful piece of equipment. Different recipes require different resources and crafting stations. Players use resources to craft new items and equipment. Some resources may only be found in specific areas of the map, stored in common and rare containers, or dropped by certain enemies. Players begin with low health and mana, which can be increased by finding and crafting specific items.

Many resources, such as metal ores, can be found while exploring caves. The game's world is made up of several layers of tiles that players can interact with and modify. The game starts in a procedurally generated world, with players starting out with basic tools and a non-player character (NPC) guide to get them started and bring their attention to aspects of the game and progression. The game is noted for its classic exploration-adventure style of gameplay, similar to games such as the Metroid series and Minecraft. The game has a 2D sprite tile-based graphical style reminiscent of the 16-bit sprites found on the SNES. Terraria is a 2D sandbox game with gameplay that revolves around exploration, building, crafting, combat, survival, and mining, playable in both single-player and multiplayer modes. Gameplay In-game screenshot showing the player at the starting area of a newly generated world in post 1.4 update

Terraria received generally positive reviews and sold over 44 million copies by 2022, making it one of the best-selling video games. The game features exploration, crafting, building, painting, and combat with a variety of creatures in a procedurally generated 2D world. The game was first released for Windows on May 16, 2011, and has since been ported to several other platforms. Terraria ( / t ə ˈ r ɛər i ə/ ⓘ ) is an action-adventure sandbox game developed by Re-Logic.

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