Java Edition Indev 0.31 20091223-0040

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The first version of Indev 0.31 was released on December 23, 2009 at 00:40 UTC.^[1][2]

This is the first version of the Indev development cycle of Minecraft, and the first paid version of Minecraft (available at €9.95), as Notch released this version for paid users to test out new features.^[1]

Lighting

• Added dynamic lighting.
• There are 9 different light levels.
  • Due to this, caves have now been made darker.
• Blocks in the inventory and hotbar are affected by lighting - upon generating a new world they appear dark, then go back to normal brightness after a while.
• Shadows appear below mobs.
• Changed shading on the sides of blocks.

Bedrock

• Added to the last layer of the world again.
• Hardness now equals 999.

👁 Image
Brown mushroom

• Changed model from 👁 Image
  .
• Inventory sprite changed from 👁 Image
  to 👁 Image
  .

👁 Image
Dandelion

• Changed model from 👁 Image
  .
• Inventory sprite changed from 👁 Image
  to 👁 Image
  .

👁 Image
Lava

• Inventory sprite changed from 👁 Image
  to 👁 Image
  (the geometry is now subtly different).

👁 Image
Red mushroom

• Changed model from 👁 Image
  .
• Inventory sprite changed from 👁 Image
  to 👁 Image
  .

👁 Image
Rose

• Changed model from 👁 Image
  .
• Inventory sprite changed from 👁 Image
  to 👁 Image
  .

👁 Image
Sapling

• Changed model from 👁 Image
  .
• Inventory sprite changed from 👁 Image
  to 👁 Image
  .

TNT

• Placing a TNT block, and then destroying it, causes the layer below to turn to wood, but only blocks made of the same material get replaced.^[3] This was used by Notch to debug flooding.^[4]

👁 Image
Water

• Changed model from 👁 Image
  .
• Inventory sprite changed from 👁 Image
  to 👁 Image
  (the geometry is now subtly different).
• The side faces now have a separate, dedicated "flowing" texture.

👁 Image
Mob

• Uses a new model and texture, known as "Rana".
• Can now spawn again.

Game modes

• This version is in Creative mode.
• TNT was removed from the hotbar.

Survival mode

• These changes can only be found by modding as the game runs in Creative by default.
  • As a side effect of the entity removal, blocks no longer drop items when mined and attempting to fire arrows doesn't do anything.
  • The player only has one bubble of air bubble when breathing underwater, down from 10.
  • The player now spawns with 99 stone slabs, stone, water blocks and lava blocks.

• The item forms of blocks are now lit differently and have been rotated such that the top texture now faces the opposite direction. The left and right sides of blocks are now lit the same. If a block used a solid white texture, the top would remain white, whereas the other two sides would be the same shade of grey:
   #828282
• The inventory sprites for water (still and flowing), lava (still and flowing), saplings, dandelions, roses, and red and brown mushrooms also changed in this version, but are excluded from the following table as they had other visual changes beyond just shading.

• New work-in-progress level format.
  • Level saving/loading no longer works.
• The world is now generated as a small size by default.^[5]
• Grass block no longer spreads.
• Leaf particles fall at the normal speed again.^{[verify for Java Edition]}
• The size of the .jar file has been changed to 1765K instead of 285K because of 4 new .md3 files. ^[6]

Creepers

• Removed.^{[verify for Java Edition]}

Pigs

• Removed.^{[verify for Java Edition]}

Sheep

• Removed.^{[verify for Java Edition]}

Skeletons

• Removed.^{[verify for Java Edition]}

Spiders

• Removed.^{[verify for Java Edition]}

Zombies

• Removed.^{[verify for Java Edition]}

Armor

• Removed plate and chain armor.

Drops

• Removed.

Player

• The player's fist no longer displays.

Multiplayer

• Now partially inaccessible, although the multiplayer code still exists and can be re-enabled.
  • Connecting to a multiplayer server causes players to spawn in a bedrock cube.^{[citation needed]}
  • The game acts as if it is in singleplayer – chat is inaccessible and the player list cannot be opened.

Music

• No longer plays.​^{[more information needed]}

Survival mode

• Can be enabled via modding.^{[verify for Java Edition]}

Sound

• No longer plays.​^{[more information needed]}

5 bugs reported

• Generating new world in a huge size sometimes causes a lot of Rana to spawn close to the player, sometimes resulting in the game freezing.
• Placing a block on a slab causes the space between to be completely dark.
• The top of the map is completely dark.
• Block breaking particles are pitch black.^[7]
• Rain now goes through glass.

• 👁 A screenshot showcasing the new dynamic lighting system
  
  A screenshot showcasing the new dynamic lighting system
• 👁 Water in this version
  
  Water in this version
• 👁 Dynamic lighting
  
  Dynamic lighting
• 👁 Dynamic lighting in a staircase
  
  Dynamic lighting in a staircase
• 👁 3D Anaglyph
  
  3D Anaglyph
• 👁 Another screenshot showcasing dynamic lighting
  
  Another screenshot showcasing dynamic lighting
• 👁 A Rana in a house
  
  A Rana in a house
• 👁 The inside of a house
  
  The inside of a house

• IRC logs on Archive.org; #minecraft.20091222.log. December 22, 2009 (UTC−6).