the quality of being interesting or amusing; the degree of interest or fun something has.
この映画の面白さは最後のどんでん返しにある。
The film's appeal lies in the final plot twist.
ゲームの面白さは繰り返し挑戦したくなるところだ。
What makes the game fun is that it makes you want to keep trying.
彼が話すことで料理の面白さが伝わってきた。
Through his talk I could feel how interesting cooking is.