Terraria is an action-adventure sandbox indie video game series, developed by game studio Re-Logic and released on Microsoft Windows, Xbox Live,PlayStation Network, Windows Phone, Android, iOS, and Kindle Fire HD. The game features exploration, crafting, construction, and combat with a variety of creatures in a randomly generated 2D world.

Originally released for Microsoft Windows on May 16, 2011. The game is estimated to have sold about 50,000 copies during its first day of release, with over 17,000 players online at the same time during the first day's peak.^[9] 200,000 copies of the game were sold, making it the top-selling game on Steamfor the week, ahead of The Witcher 2 and Portal 2.^[10] It remained number one on Steam for the first six days of its release,^[11] and as of January 2014 has sold over 2,500,000 copies.^[12] Terraria became DRM-free on October 2, 2014 when it was released on GOG.com.^[13]

The game was released on PlayStation Network and Xbox Live Arcade (worldwide except for Europe and Australia) at the end of March 2013 with exclusive content. The PS3 European and Australian release date was May 15, 2013.^[1] It was announced on March 28, 2013 that Terraria is coming to the PlayStation Vita. It was released on December 11, 2013.^[3] The PlayStation 3, Xbox 360 and PlayStation Vita versions were developed by Dutch studioEngine Software. On August 29, 2013, Terraria was released on iOS phones and tablets, after development by the Dutch studio Codeglue.^[14] The iOS edition of Terraria received a large update on August 28, 2014, bringing "Hardmode", a part of the game previously not available on mobile platforms. The game was also released on Android on September 12, 2013.^[15] Terraria was released on Xbox One and PlayStation 4 on December 2, 2014 on physical disc, and digital release on November 11, 2014.^[16] On September 13, 2014, Re-Logic announced that Terraria would be coming to OS X and Linux.^[17]