Minecraft Wiki
Classic 0.0.20a 01.png

Java Edition

Server version


Release date

June 20, 2009


Client (.json)

Protocol version




0.0.20a_01[1] is a version of Java Edition Classic released alongside server version 1.8.2 on June 20, 2009, at 21:11 UTC.[2][3]


  • Dirt and cobblestone positions are now switched to third and second slots in the hotbar, respectively.[4]


3 bugs fixed
  • Fixed a bug that caused clients to build unbreakable blocks.[2]
  • Fixed a protocol error.[2]
  • Fixed FPS issues.[5]


  • Water transparency is bugged.[5][6]
    • Sometimes, the water looks opaque.[7]
    • Water tiles have light blue bits in their borders.[8]
  • Usernames are now harder to read.[9]



  • IRC logs on Archive.org; #minecraft.20090620.log. June 20, 2009 (UTC−5).
  1. http://web.archive.org/web/20181207044622/http://tinypic.com/view.php?pic=2lvlc14&s=5
  2. a b c "New minecraft-server.zip, new client" – Notch, June 20, 2009, Tumblr – This blog post mentions that it fixed players being able to build using unbreakable blocks, which is also mentioned in the IRC logs: "P4:09:25 <Notch> new minecraft-server.zip that doesn't allow that block" (21:09:25 UTC), therefore the blog post does refer to this version.
  3. IRC logs: "P4:11:32 <Awol10> wingboy: tried downloading again. the jar file should have an 11:09pm timestamp" (21:11:32 UTC)
  4. IRC logs: "P5:05:09 <mezo> notch, in the last version dirt was 2 and cobble was 3, now it's the other way around" [...] "P5:05:23 <Notch> ah! that's intentional, mezo" (22:05 UTC)
  5. a b IRC logs: "P4:13:25 <Notch> does it work better now?" [...] "P4:13:36 <LKA> Notch: FPS is fine now but water transparency is broken now" (21:13 UTC)
  6. IRC logs: "P4:12:28 <LKA> water transparency is being hilariously awkward" (21:14:23 UTC)
  7. IRC logs: "P4:14:23 <LKA> I dunno, for me sometimes the water is opaque then I look down from the surface and I can see through it just fine" (21:14:23 UTC)
  8. IRC logs: "P4:16:04 <Syndlig> Looking straight down at water..." [...] "P4:16:08 <Syndlig> It turns into a grid.", "P4:16:14 <Syndlig> Light blue lines at the corners of the water tiles." [...] "P4:16:38 <Notch> yeah, water tiles have weird borders" [...] "P4:17:26 <LKA> It goes through various shades of opaqueness" (21:16 to 21:17 UTC)
  9. IRC logs: "P4:14:32 <paul|2> I'm getting errors with names" [...] "P4:14:38 <paul|2> the dropshadow gets a bit weird" [...] "P4:28:04 <Syndlig> The closer a player is to you the whiter their name gets." [...] "P4:28:12 <Syndlig> If they're next to you the name is white-on-white and unreadable." [...] "P4:29:38 <wingboy> the names above peoples head look weird" [...] "P4:30:30 <ez> yes, names look odd" (21:24 to 21:28 UTC)