One of the main criticisms we had of the Bronze Award-winning Terraria was its lack of multiplayer.
Today, 505 Games has remedied this by adding up to four player co-op to Terraria on iOS. The same update on Android doesn't appear to be available as of writing.
The newly added multiplayer works across any device using wi-fi. So now your friends can join you in digging holes, building houses, and fighting demons.
PvP has also been added, meaning that you can fight your friends in teams, or in 1v1 matches.
The other new feature is being able to touch and drag items in your inventory bar to drop them into the world with ease.