What changed in Terraria in 2011

Weapons and accessories gain random modifiers, with reforging available from a new NPC; four armor sets expand equipment choices.

Defeating the Wall of Flesh makes the world more dangerous, introduces the Hallow and enables new ore.

Smooth colored lighting and an interface for assigning and checking NPC housing expand presentation and building tools.

Wrenches, wires, switches, pressure plates, timers and pumps add mechanisms and liquid transport.