Bukkit

Custom-Worlds: (/wold)

• Create "Normal" world (/world create <name> normal)
• Create "Nether" world (/world create <name> nether)
• Create "End" world (/world create <name> end)
• Create "Flat" world (/world create <name> flat)
• Create "Empty" world (/world create <name> empty)

or

• Create "Custom Superflat" world (/world create <name> <generator>)
  • Generator example: (<generator>)
    • preset=bedrock;6,sand;2,slime_block
      (Use this to create a world with 1 bedrock layer, 6 sand layers and 2 slime layers)