Java Edition Beta 1.6.3

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Minecraft Beta 1.6.3
Beta 1.6.3.png
Beta 1.6.3 in-game.png

Java Edition

Release date

May 26, 2011

Download Client (.json)
Protocol version


Other editions of 1.6.3

Beta 1.6.3 was mainly released to fix some of the bugs and crashes in Beta 1.6.2.



  • 2 blocks deep water doesn't prevent fall-damage anymore. Players will need at least 3 blocks deep water to prevent fall damage.


  • The renderer is now capped at 100 fps while there are chunks to be generated. The excess time will be spent generating chunks instead of rendering frames.
  • The "limit framerate" option now limits the game to 40 fps and will spend at least 10 ms per frame sleeping.
  • The "limit framerate" option has been reset to "off" for all players, enable it again if wanted.


3 bugs fixed

  • Fixed some block updates not updating lighting properly under some circumstances by reverting the "don’t always send block data" fix in 1.6.
  • Fixed a major CPU load issue in the server where a very tight loop would starve all other threads.
  • Fixed furnaces dropping/duplicating their contents when they change state from lit to unlit or back.