I was digging underground in Terraria and when I was mining some stone, I noticed they had red spots on them called Active Stone Blocks. When I had it in my characters hand, there were red lines starting to go down the tunnel I was going down through. What are these red lines?

I'm a beginner of Terraria, so I don't know much about this.

2 Answers 2


Those red lines are wire, which is used to connect triggers and mechanisms. Wire is invisible unless you're holding something that can interact with it, like the Active Stone Block, which becomes non-solid when activated by wire. In the underground, you will usually find it connecting pressure plates to various traps. You can check the wiki for more information.

  • 1
    Thanks. I'm just a beginner at Terraria, and I don't know much about wiring. Thanks a lot for the answer.
    – Jim Jones
    Sep 12, 2016 at 0:21
  • 4
    And if you see it underground, and you didn't put it there - its probably a trap... so watch out ;) Sep 12, 2016 at 4:44
  • 1
    @JimJones Use it as a trap finder- many a time I would of died, if it weren't for my wrench and light. (Sorry for trying to rhyme, I don't do it most of the time)
    – Dan Brown
    Sep 12, 2016 at 9:10
  • I know. The boulder traps (that's what I learned) I will avoid.
    – Jim Jones
    Sep 13, 2016 at 2:24

Sometimes they hold boulders, and when you're underneath the trap, the active block moves, and it drops the boulder. I'm guessing you dug through a boulder trap.

  • @9t. He did provide an answer (the red lines hold boulders). If it's wrong no need to flag it as "Not an answer", it's still an answer, just a wrong one
    – Oak
    May 23, 2017 at 15:44
  • @Oak I may or may not have forgotten to read the whole question since I was in a rush. Apologies.
    – user114997
    May 23, 2017 at 15:45

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .