Minecraft Wiki
Minecraft Wiki
Minecraft 12w27a
Java Edition 12w27a.png

Java Edition



Release date

July 5, 2012[1]

Snapshot for



Client (.json)
Server (.exe)

Protocol version


12w27a is the fourteenth snapshot released for Java Edition 1.3.1.


Command format[]

/debug <start|stop>
  • Starts/stops debug profiling.



Nether wart
  • Updated pistons to make them less error-prone, thus they also appear to update slower.
  • This also altered the way pistons work, so the player might have to adapt their repeater delays and similar.
  • For this change, pistons now take 2 redstone ticks (4 game ticks) to expand, but they still retract instantly.
  • Signs are stackable up to 16.
  • Crafting them now gives 3 signs instead of 1 with the same recipe.

Non-mob entities[]

  • Boats now drop the boat item when destroyed by a player.


Creative inventory
  • Gaining experience from mining ore is now different for each type of ore (mining coal ore will give the player the least amount while diamond ore & emerald ore will give the most amount of XP).


13 bugs fixed

  • Newly added wooden stairs will now burn.
  • Fixed /kill not working.
  • Fixed powering specific glitched pistons crashing the game.
  • Fixed a visual bug causing pistons to be partially invisible or in the wrong location momentarily.
  • Fixed being able to place portals in the Nether in locations where they would end up in illegal locations in the overworld.
  • Fixed the game crashing when publishing SP worlds with certain language settings.
  • Fixed players on minecarts, boats or pigs and spider jockeys not being displayed in the correct location.
  • Fixed a bug with dispensers.
  • Fixed /say not accepting some strings form the console, often triggering the help dialogue.
  • Fixed being able to transmute blocks to certain data values using an orientation-dependent tripwire bug.
  • Fixed drinking potions in creative not consuming the potions, but still giving empty bottles.
  • Fixed signs sometimes not saving the text when placing them.
  • Fixed torches at the top of 1×1 vertical shafts not lighting up their own block.