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Cave game tech test

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Cave game tech test
Cave game tech test.png

Java Edition

Official name

Cave Game tech demo[1]

Date developed

May 10–13, 2009



Cave game tech test[2] is the name of a video released by Notch on May 13, 2009. While the version shown was never publicly available to play, it was developed from May 10, 2009,[3] and showcased on May 13, 2009. It is the first known version of Minecraft, or Cave Game, as it was referred to in this time period.



  • Physics
  • Lighting
  • Chunks
  • World generation
    • 256×64×256 tile map.
  • Caves
    • Reached down until a few blocks before the last layer of cobblestone, making a ravine.
  • Creative mode
    • This was an extremely basic version of it. The player could not fly or place blocks and there was no inventory or hotbar to get them from.


  • The player
    • Currently has no visible model.
    • Has a height of 1.7 blocks.


  • Air
    • Not listed internally as a block at this time.
  • Cobblestone
    • Made with the same graphics from Notch's game RubyDung.
  • Grass
    • Made with the same graphics from RubyDung.
    • Only generates on tiles that are lit.


The Cave Game code was edited multiple times during the time it was developed. Here is a list of all known edits to the code:

  • May 10, 2009: Game first developed.
  • May 12, 2009: Fixed a performance issue.[4]
  • May 13, 2009 (17:41 UTC): Notch made it only update two chunks per frame.[5] The game generates blank chunks and the FPS is inaccurate.
  • May 13, 2009 (17:48 UTC): Game now runs smoother.[6]
  • May 13, 2009 (17:51 UTC): Chunks have been changed from 8×8×8 to 16×16, and chunks near the player will load first.[7] This was the build that Notch showcased on his YouTube channel.




  1. Cave Game tech demo!The Word of Notch
  2. "Cave game tech test" – via YouTube (Archive)
  3. "About the game" (archived) by Mojang AB. Minecraft, March 1, 2010.
  4. "lwjgl IRC logs" – Echelog, May 13, 2009. "<Notch> i was trying to narrow down a performance issue last night."
  5. "lwjgl IRC logs" – Echelog, May 13, 2009. "<Notch_> I made it only update two chunks per frame maximum, and it's very slow"
  6. "lwjgl IRC logs" – Echelog, May 13, 2009. "<Notch_> I managed to force it to do as I want now. 72 fps, 288 chunk updates per second"
  7. "lwjgl IRC logs" – Echelog, May 13, 2009. "<Notch_> i'll update tiles chunks the player first, and force a full update upon game start"