Cave game tech test

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 "field": "May 13, 2009",
 "label": "Date developed"
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Cave game tech test ^[1] or Cave Game tech demo^[2] is the earliest publicized unreleased version of what would become Minecraft. It was made on May 13, 2009, between roughly 16:48^[3] and 16:55 UTC.^[4] A video of the game at this time was recorded by Notch sometime between 17:00 and 17:14 UTC, and uploaded at 17:36 on May 13.^[5] It is the earliest known version of Minecraft, or what was then known as Cave Game, to have been recorded.

Development of the game started around May 10^[6] or 11^[7] to May 12 at the latest,^[8] and continued up to May 13, 2009, adding the features that would be later seen in the Cave game tech test video.

👁 Image
Air

• Not listed as a block at this time.

👁 Image
Grass

• Made with the same graphics from Notch's game RubyDung.
• Grass appears on fully lit tiles on the top 7 layers of the map.
• Had the same texture on all sides of the block.

👁 Image
Rock

• Made with the same graphics from Notch's game RubyDung.
• Its texture at this time would later be repurposed for cobblestone.
• Rock would later be renamed to stone.

Player

• Currently has no model.
• Has a height of 1.7 blocks.
• Cannot perform any other actions other than moving.

Caves

• Pass from the uppermost layer of the grass block to the penultimate layer of stone.

Chunks

• Takes about 0.1 seconds to generate.^[9]
• The size of each chunk is 16×16 blocks.^[10]
  • Chunks are 16×16 blocks instead of 8×8 because 8×8 chunks decreased performance.^[4]
• Chunks are loaded in order of their proximity to the player.^[11]
• The player spawns in a 256×64×256 tile map.
  • The game takes 20 seconds to generate a 256×64×256 map.^[12]
• It was possible to fall out of the world, but it would not kill the player.

Controls

• WASD key use for movement.
• Space key for jumping.
• Moving the mouse moves the camera.
• Can’t break or place blocks.
• Holding down causes the player to respawn in a random X and Z coordinate at Y=74 every game tick (which is 1/60th of a second long prior to rd-20090515) until the key is released.
  • If the player falls into the void, they fall infinitely unless they press .

Light

• The lighting engine in Classic and pre-Classic was simple, with only 2 light levels, bright and dark.
  • "Sunlight" is emitted by the top edge of the map and hits any block that is under it, regardless of distance. It passes through transparent blocks to light blocks underneath.
  • Blocks that do not receive light are in a dim shadow that remains at the same level of brightness no matter how far they are from a light source.
  • Blocks which are darkened also have a layer of thick, black fog applied to them, appearing darker when looked at from further distances. This caused weird visual quirks.

Sky

• The color of the sky is
   #7FCCFF.

Original

Archive

• 👁 A cave
  
  A cave
• 👁 The chunks were loaded slow in this version
  
  The chunks were loaded slow in this version
• 👁 The bottom stone layers in this version
  
  The bottom stone layers in this version
• 👁 The ground in this version
  
  The ground in this version
• 👁 A pit, with a contrast of light and dark on the left and right to illustrate the simplicity of the lighting engine in this version
  
  A pit, with a contrast of light and dark on the left and right to illustrate the simplicity of the lighting engine in this version

• "lwjgl IRC logs" (archived) – Echelog, May 13, 2009 (UTC+2).
• Rotab's IRC logs on Archive.org; #minecraft.20090525.log. May 25, 2009 (UTC+2)