Alpha Codes

Minecraft Alpha servers support special codes that affect world generation. Set these in your Server Title so that they initialize with the server.

For example,

Initial code
This must go before any other code for the code validation to work properly.

If the previous code did not work, it is because your system is configured in +r mode. Use the code below.

Map codes
These must go after your initial code, in alphabetical order. Each code must be separated with a space.

You may use several or none of these. You do not need to use them all, but those you do not use will default to a value of 5.


 * - ascending rock, determines the likelihood of large rock mountains (max value of 10)


 * - big caves, determines the likelihood of bigger caves being spawned (max value of 10)


 * - deep water, determines the likelihood of water being deep (max value of 10)


 * - flat map, determines the likelihood of areas of flat terrain such as deserts and plains grass (max value of 20, default of 7)


 * - tall trees, determines the likelihood of an area of taller trees spawning (max value of 5, default of 2)

Outdated codes

 * - no longer works in versions of Minecraft more recent than August 2010.