These just appeared. What's going on?!

enter image description here

enter image description here

They seem to follow me around, but appear patchily. What have I done?

  • You're currently FIRIN' YUOR LAZORS. There is no option to turn them off because they are awesome.
    – Alex
    Commented Aug 29, 2014 at 10:14

2 Answers 2


They are marking locations where hostile mobs can spawn.

It is a feature of Not Enough Items (NEI) and the default key (configurable) to toggle this on and off is F7.


Those show tiles where it is dark enough for monsters to spawn, I believe. Check in the controls to see if there is a key bound to something like that. You may have hit it by accident.

  • Which mod adds this?
    – ChrisF
    Commented Mar 11, 2013 at 23:29
  • I'm not sure, I haven't seen it myself. I used to have a local modpack that let me do this, so I just recognize the effect.
    – SaintWacko
    Commented Mar 11, 2013 at 23:32

You must log in to answer this question.

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