Current difficulty of the world. 0 for peacefully, 1 for easy, 2 for normal and 3 for hard.
Gamemode currently used in the world. 0 for survival, 1 for creative, 2 for adventure and 3 for spectator.
Indicates whether the world is deleted when the player dies.
Name of the world.
Seed of the world.
Informations about a level (world) usually found in level.dat in NBT format.