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Java Edition 13w01a.png

Java Edition



Release date

January 3, 2013[1]

Snapshot for



Client (.json)
Server (.exe)

Protocol version


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



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 JE1 BE1.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
Nether Quartz Ore JE1 BE1.png Nether quartz ore
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.


Nether Brick JE1 BE1.png Nether Brick
Nether Quartz JE1 BE1.png Nether quartz



Locked Chest (S) JE4.png Locked chests
  • Texture for the block was changed from Locked Chest JE3.png
  • Are more stable from previous versions.
    • Sticky pistons are less sticky.
Redstone circuits
  • Are now more consistent.


  • Now shows the item name in-game.


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.


  • [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.


3 issues fixed
From released versions before 1.5
  • MC-177[12w26a] Clocked piston arm turns invisible when exiting game/dying/etc.
  • MC-184[Beta 1.2] (Powered) redstone doesn't update right.
  • MC-5621[Beta 1.7] Blocks like redstone dust, repeaters, doors, and levers don't drop when the underlying block is pushed by a piston.



  • 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.