Java Edition pre-Classic rd-131655

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Java Edition

Official name

Cave game tech test[1]
Cave Game tech demo[2]

Date developed

May 13, 2009



This page documents an unreleased version.
While there is proof of this version's existence, it was never released to the public.

rd-131655 (officially known as Cave game tech test[1] or Cave Game tech demo[2]) was a pre-Classic version made on May 13, 2009, at 16:55 UTC.[3] This version was never released, but was recorded by Notch from around 17:00 UTC and uploaded at 17:36.[4] It is the first known version of Minecraft, or what was then known as Cave Game, to have been recorded, although there were some builds before this version.


  • Each chunk is now 16×16 blocks instead of 8×8 to improve performance.[3]
  • Chunks are now loaded in order of their proximity to the player.[5]


  • The game takes 20 seconds to generate a 256×64×256 map.[6]




  1. a b "Cave game tech test" – Nizzotch, May 13, 2009 – via YouTube (Archive)
  2. a b "Cave Game tech demo!"The Word of Notch, May 13, 2009
  3. a b IRC logs: "[18:55:45] <Notch_> the chunk size is 16x16 now.." [...] "[18:56:47] <Notch_> 8x8 chunks are SLOWER"
  4. IRC logs: "[19:00:52] <Notch_> hmm, I wonder if I could make a vid of this" [...] "[19:14:02] <Notch_> haha, the video ended up at 1.05 GB" [...] "[19:15:36] <Notch_> well, this is annoying. I guess I have to recapture. Google has a limit of 2 gb" [...] "[19:36:42] <Notch_> upload complete, processing video" [...] "[19:50:18] <Notch_> ok, the quality is still crap until the processing finishes, but:"
  5. IRC logs: "[19:51:48] <Notch_> i'll update tiles chunks the player first, and force a full update upon game start"
  6. IRC logs: "[20:02:58] <Notch_> it takes like 20 seconds to grow a 256*256*64 map, though. :-\"