Minecraft:Java Edition 12w39b

12w39b is the ninth Minecraft:snapshot for Minecraft:Java Edition 1.4.2, released on September 28, 2012<ref>https://twitter.com/Dinnerbone/status/251683603593957376</ref> to fix some of the bugs and crashes in the Minecraft:12w39a snapshot.

Additions

Blocks

Minecraft:Mob spawners

• More options to customize spawners.
• Can now have their range and maximum spawn limit customized.

Items

Custom Minecraft:potions

• Only available by editing in with a world editor.
• Players can create potions with multiple effects.

Command format

Template:Cmd

• Added a command variable to the command.
  • Use L after number to represent number of levels, not number of xp.

Minecraft:Target selectors

• Added command block arguments.
  • Added l and lm arguments for indicating players with a maximum level, and minimum level, respectively.
  • Added rm argument for indicating the minimum range to which players are affected.

Fixes

7 bugs fixed

• Fixed block placement issues with lighting.<ref>Template:Tweet</ref>
• Game performance is now better from before.
• Fixed "Bottomless Pit" preset.
• Jack o' lantern emitting stronger light from the wrong face fixed.
• Fixed the witch's texture being weird.
• Partially fixed Nether lag by making the server do some of what used to be the client's work and increasing chunk load time slightly.<ref>Template:Tweet</ref>
• Fixed some lighting bugs related to upside down slabs and stairs and farmland.