Terraria

Terraria is a 2D action-adventure sandbox video game developed by Re-Logic. The game was initially released for Microsoft Windows in May 2011, and has since been released for various other platforms and devices. Gameplay of Terraria features exploration, crafting, building, and combat with a variety of creatures in a procedurally generated 2D world. Terraria received generally positive critical reception upon release, with direct comparisons to Minecraft and praise given to its sandbox elements. By February 2017, the game had sold over 20 million copies across all platforms.

Terraria is a 2D sandbox game with gameplay that revolves around exploration, building, and combat.  The game has a 2D sprite tile-based graphical style reminiscent of the 16-bit sprites found on the Super NES.  The game is noted for its classic exploration-adventure style of gameplay, similar to titles such as the Metroid series and Minecraft.

The game starts in a procedurally generated world. The player starts with three basic tools: a pickaxe for mining, a shortsword for combat, and an ax for woodcutting. Many resources, notably ores, can be found while mining or exploring underground caves. The player begins with a limited amount of health and magic points, which can be increased by finding certain items by exploring. Some resources, and most items, may be found in certain areas of the map, stored in common and rare containers, or dropped by certain enemies. The player uses resources to craft new items and equipment at an appropriate crafting station for that recipe. For example, tables or other items can be crafted at a work bench, and bars can be smelted from ore at a furnace. Several advanced items in Terraria require multiple crafting operations where the product of one recipe is used as an ingredient for another.

The player can encounter many different enemies in Terraria, such as simple slimes, zombies, demon eyes, and various biome-specific enemies. The occurrence of certain enemies depends on several factors including time, location, random events, and player interactions. The player can fight against enemies with swords, bows, guns, magic spells, and other weapons. The player may also battle boss monsters during the game with a number of different combat mechanics that can drop rare items and large amounts of in-game currency. All bosses can be summoned by using certain items, destroying blocks through the world, or randomly when certain criteria are met. Several of the bosses can spawn naturally in certain places and times. The defeat of these bosses is often tied to in-game progression.

By completing specific goals (such as defeating a boss or obtaining a gun), players can attract non-player characters (NPCs) to occupy structures or rooms they have built, such as merchant, nurse, or wizard. Some NPCs will be acquired by finding them throughout the world and will then reside in the player's house. Players may then buy or sell items and certain services from NPCs with coins found in the world. Some NPCs can not currently be found in the mobile versions of the game. The game includes a currency system in the form of coins that can be primarily used to complete transactions with NPCs. Coins can be obtained by slaying monsters, finding treasure, and selling items to NPCs.

The game recognizes many different biomes and areas, defined by the blocks that exist in the vicinity, each home to a unique set of enemies. If the player journeys to the Underworld and summons and defeats a boss there called the Wall of Flesh, the game enters "hardmode", which adds many new and much stronger enemies throughout the world, as well as new NPCs, bosses, ores, and items.

The game also features an expert mode difficulty.  Enabled when creating a world, expert mode increases the difficulty of the game by doubling the health and attack of monsters and bosses, further increasing the strength of weaker enemies after hardmode, giving the bosses new attack patterns, decreasing the effectiveness of life regeneration, and other tweaks. To deal with the higher attack damages of the expert mode the defense statistic is more effective than in normal mode. In addition to the higher difficulty level, expert mode increases the chance for enemies to drop rare items, and adds new items that can only be obtained by defeating the bosses on expert mode.

In addition to standard gameplay, Terraria has a modding community