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12w40a Banner.png


Release date

October 4, 2012[1]

Snapshot for




Protocol version


12w40a is the tenth snapshot released for 1.4.2.


  • Added swamp hut structures, for witches to spawn in.
  • Added superflat preset "Redstone Ready" with 52 layers of sandstone, 3 layers of stone and 1 layer of bedrock.
  • Custom Item naming NBT tags (intended for custom map makers).
    • Using the NBT, it is possible to add custom names to items, as well as a lore list for that item.



13 bugs fixed

  • Fixed the wither's starting explosion not being disabled by the mobGriefing gamerule[2]
  • Fixed a few crash bugs related to world generation, map item expansion, and other things.
  • Reverted previous lighting changes, which corrected such bugs as:
    • The Nether being extremely CPU intensive.
    • Map generation taking extremely long.
  • Fixed mob AI considering cobblestone walls as blocks of normal height.
  • Fixed a few texture oddities with the witch.
  • Fixed entities in water producing glitchy water sound.
  • Gaining multiple levels at a time will no longer play the leveling up sound over itself as many times as leveled.
  • Fixed the "A 64 bit Java installation is recommended for 'Far' render distance (you have 32 bit)" message being covered by the bottom 2 buttons.
  • Fixed pets teleporting around randomly[3]
  • Fixed being unable to place paintings larger than 1x2 and them popping off if they have been placed before
  • Fixed destroying blocks under you with Efficiency-enchanted gear
  • Fixed potion spawners crashing the game[4]