The degree or level of difficulty; a measure indicating how hard a task, test, or problem is.
試験の難度は昨年より上がった。
The difficulty level of the exam increased compared to last year.
ゲームは難度を三段階から選べる。
The game allows you to choose the difficulty from three levels.
課題の難度に応じて報酬が変わる。
Rewards change according to the task's difficulty.
この山の登山難度は初心者には高い。
The climbing difficulty of this mountain is high for beginners.