Java Edition 13w01a

13w01a is the first snapshot released for Java Edition 1.5, and the first snapshot released in 2013.

Blocks

 * Block of Redstone JE1 BE1.png Block of redstone
 * Stores redstone dust similar to blocks of diamond, etc.
 * Emits constant redstone power.
 * Works as a pushable redstone power source.


 * Daylight Detector.png Daylight sensors
 * Output power while receiving sunlight.
 * The level varies depending on the time (more sunlight=more redstone power), and it does not function at night.


 * Hopper (D) JE1.png Hoppers
 * Places and takes out items in hoppers, chests, furnaces, minecarts with chests, dispensers, and brewing stands.
 * Allows for the automation of many processes.
 * Still a work in progress (as indicated by the inventory icon Hopper (item) JE1.png).


 * Nether Quartz Ore JE1 BE1.png Nether quartz ore
 * New ore exclusive to the Nether.
 * Drops 1 nether quartz item when mined.
 * Generates around netherrack.


 * Redstone Comparator (S) JE1.png Redstone comparator
 * Has 2 inputs and 1 output.
 * If A≥B, the output will be A, otherwise it will stay off – When the comparator is toggled, it will output full strength instead of A it will subtract B from A and need a comparator as input for B.
 * Replacement for the capacitor.
 * Whichever side gives the bigger signal will be considered signal B.


 * Trapped Chest.gif Trapped chests
 * Gives out a signal depending on the amount of players looking inside. 1 person = 1 strength signal, 2 people = 2, etc.
 * Crafted with a chest and a tripwire hook.
 * Large trapped chests can be staggered with large chests to allow more compact storage.
 * Texture is slightly different than a normal chest, with a red stain around the latch.


 * Light Weighted Pressure Plate JE1 BE1.png Heavy Weighted Pressure Plate JE1 BE1.png Weighted pressure plates
 * Detects item stacks.
 * Gold version reaches full strength at 60 items.
 * Iron version reaches full strength at 600 items.
 * Linear, so 10 strength signal means twice as many items as a 5 strength signal.

Items

 * Nether Brick JE1 BE1.png Nether Brick
 * Used for crafting nether bricks.
 * Obtained by smelting netherrack.
 * Crafting recipe is 2×2 nether bricks.


 * Nether Quartz JE1 BE1.png Nether quartz
 * Item dropped from nether quartz ore.

Blocks

 * Locked Chest JE4.png Locked chests
 * Texture for the block was changed from Locked Chest JE3.png


 * Pistons
 * Are more stable from previous versions.
 * Sticky pistons are less sticky.


 * Redstone circuits
 * Are now more consistent.

Items

 * General
 * Now shows the item name in-game.

Gameplay

 * Death messages
 * Now show the weapon someone was killed with.


 * Inventory management
 * Double-click items to fill the stack up as much as possible.
 * Drag item stacks around to divide them up over the dragged-over slots.
 * Drag item stacks around with the right mouse button to place one of that stack in each dragged-over slot, if that slot is not occupied already.
 * Shift double-click an item stack to move all other item stacks of that kind to that part of the inventory.
 * Press Q while the mouse is over an item in the inventory or a container to drop it.

Bugs

 * [MC-5711] Redstone torches attached to the side of a block do not pop off if the block supporting them is destroyed.
 * [MC-5721] Dragging to spread an item out in the creative inventory, then clicking on the inventory tab, and placing the 0 stack item down, the game will crash.
 * [MC-5728] Infinite loop caused by subtraction mode comparators causes the world to be unplayable.
 * Mineral duplication: you can exponentially dupe minerals by putting then in a crafting table with a block of their material, then double clicking on a mineral in the crafting table, works on the same principle as the method below.
 * Crafted item duplication: Any stackable crafted item can be duplicated by setting up its recipe in a crafting table, then double clicking an existing version of this item in the inventory. Requires at least one of that item to be present in the inventory.

Trivia

 * Along with 18w01a, 13w01a was released on the earliest calendar year out of all snapshots, on January 3.
 * Until this point, the snapshot released on the earliest calendar year out of all snapshots was 12w01a on January 5.