Minecraft wiki entry for Difficulty, associated text: Regional difficulty or local difficulty is a value between 0.00 and 6.75 that the game calculates by considering not just the world difficulty setting, but also the inhabited time of a chunk, the total daytime in the world, and the phase of the moon. This value is shown on the debug screen as the first value listed after the heading "Local Difficulty". This value determines several aspects of the difficulty of gameplay (see below).