I wandered around a medium-sized swamp for 2 nights, when the moon was on the Waxing Gibbous and Full Moon phases, and I found 0 slimes during the entirety of that time. Is it just a 1.8 glitch? I have been needing slimes for a long time now, and I'm frustrated that I have found none during the time they should be spawning the most. And no, it is not on difficulty "Peaceful".

  • Did you light the swamp up? Slimes only spawn at a low light level in swamps. – ModDL Nov 5 '14 at 19:26
  • I tried lighting up some spots during the first night so slime spawns didn't have to "compete" with mobs such as skeletons and zombies, but during the full moon there were no torches placed. – Genesisrising187 Nov 5 '14 at 19:29
  • whats your Y coordinate? – ModDL Nov 5 '14 at 19:51
  • I've been staying in the area of 61-69, since that is where they spawn in swamps. I've been staying far enough away so they could spawn there, but no luck. – Genesisrising187 Nov 5 '14 at 20:26

Slimes only can spawn in a swamp if the swamp is between Y-levels 50 and 70. In addition, slimes will also only spawn if the light level is at most 7.

To be more accurate:

"More precisely, the game checks if the light level is equal to or less than a random integer (from 0 to 7), then if the fraction of the moon which is bright is greater than a random number (from 0 to 1). If these conditions are met and the altitude is acceptable, there is a 50% chance of spawning a slime."

~~~ MinecraftWiki article on Slimes

Slimes can actually be rather rare if the random number generator does not like you.

In addition, slimes follow all normal mob spawning rules. They will only spawn if you are within 16 to 144 blocks from a "valid" area.

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