Minecraft Wiki
Note: This version is not available in the launcher and is considered lost.

0.0.21a_01[1][2][3][4][5] was a version of Classic released on June 23, 2009, at 16:17 UTC.[6][7]


  • Attempted to fix a "hang bug" by adding a max iterations to the clipping.[6][8]
    • However, the game still hang.[9]



  • IRC logs on Archive.org; #minecraft.20090623.log. June 23, 2009 (UTC−5).
  1. "MineCraft house tour" – Chantaru413 on YouTube, June 26, 2009
  2. https://oi194.photobucket.com/albums/z61/ninjachuck385/cavern3.png
  3. https://www.youtube.com/watch?v=DrkcrYoxl3Y
  4. https://www.youtube.com/watch?v=R-RicZjBaXk
  5. https://www.youtube.com/watch?v=8Xv4XU9D4DY
  6. a b "Is the hang bug fixed in 0.0.21a_01?" – The Word of Notch, June 23, 2009
  7. IRC logs: "A11:17:11 <08Notch> client 0.0.21a_01 is up, fixing the hang bug" (16:17:11 UTC)
  8. IRC logs: "A11:40:57 <08Notch> the only difference between 0.0.21a and _01 is that I added a max iterations on the clipping" (16:40:57 UTC)
  9. IRC logs: "A11:24:10 <08Notch> so it still hangs? :-O [...] A11:24:14 <akuryo> yeah notch" (16:24 UTC)