Terraria is an action-adventure sandbox indie video game series, developed by game studio Re-Logic, available on Microsoft Windows with ports for Xbox Live, PlayStation Network, Windows Phone, Android, and iOS. 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. 200,000 copies of the game were sold, making it the top-selling game on Steam for the week, ahead of The Witcher 2 and Portal 2. It remained number one on Steam for the first six days of its release, and as of January 2013 has sold over 2,500,000 copies. Terraria became DRM-free on October 2, 2014 when it was released on GOG.com.

– Wikipedia

Terraria (latest)

Terraria Portable (latest)

Cracked installers for Terraria:
Terraria 1.0.5 Setup
Terraria Setup
Terraria 1.1 Setup
Terraria 1.1.2 Setup
Terraria Setup

Portable versions (do not need XNA runtime or Administrator access, and and above don't even need .NET):
Terraria 1.1 Portable
Terraria Portable