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Minecraft 12w30a
Java Edition 12w30a.png

Java Edition



Release date

July 23, 2012[1]

Snapshot for



Client (.json)
Server (.exe)

Protocol version


12w30a is the fifteenth snapshot released for Java Edition 1.3.1.



  • Snooper Settings
    • Allows the player to toggle whether their data are sent to Mojang for analysis and improvements, shows which data will be sent to Mojang.
  • Added Vertical Synchronization in Video Settings
    • Has to be toggled manually in options.txt
  • Fullscreen mode setting is now persistent
    • Has to be toggled manually in options.txt



  • Stairs, when placed on the upper half of a block's side, will now be placed upside-down.


  • Depending on difficulty, explosion damage is now scaled.
    • Peaceful: No damage.
    • Easy: ~50% less damage.
    • Normal: same damage as before.
    • Hard: ~33% more damage than before.
    • "In full diamond armor + hard difficulty a creeper can knock you down to 2 hearts."[2]

World generation[]


Command format[]

/gamemode 3
  • Survival mode's command is now /gamemode 0


F3 Debug screen
  • In F3 mode, the y coordinate now shows both the feet level and the eye level.
  • Accelerated chunk loading.
  • Decreased lag spike frequency.
  • Made chat work smoothly even when the server is lagging.
  • Decreased unnecessary world updates.
  • Decreased packets sent between client and server.
  • Creeper explosions, fire charge explosions, and TNT give off a knock back.


19 bugs fixed

  • Fixed existing signs not showing text.
  • Fixed monster spawners all looking like pig spawners.
  • Fixed ⌘ Cmd + C, ⌘ Cmd + x and ⌘ Cmd + V not working on Mac OS X.
  • Fixed sneaking players' nameplates not staying hidden when loading the chunks the sneaking players are in.
  • Fixed multiple chunks often not displaying.
  • Fixed higher server-set view distances instantly kicking joining players.
  • Fixed sections above Y = 191 becoming invisible when loading worlds.
  • Fixed not completely generated chunks not updating visually until walking into them.
  • Fixed compasses not pointing to spawn but to X=8 & Z=8 after respawning.
  • Fixed other players' fishing lines looking like they start from their feet.
  • Fixed a bug with Unbreaking-enchanted tools and destroying blocks.
  • Fixed being able to move LAN servers in the server list and crashing the game.
  • Fixed opening SP worlds to LAN, saving and quitting it leaving the server running and showing up in the server list.
  • Fixed pushing a minecart with the movement keys causing the camera to shake in the direction pressed.
  • Fixed potion effects losing their graphical effects when traveling between dimensions.
  • Fixed Ghast's fireballs getting stuck mid-air when unloading their chunk, might apply to fire charges and blaze's fireballs as well.
  • Fixed the last slot in the opened creative inventory's hotbar being one pixel too short on all but the survival inventory tabs and a few pixels being off on the survival inventory tab.
  • Fixed blocks disappearing when you placing them under yourself and jumping.[3]
  • Fixed the client trying to trample crops instead of letting the server dictate trampling.