“This game has a steep learning curve, so it’s good for people who like a challenge.”
A steep learning curve means that, even if something is easy at the most basic level, the difficulty increases very quickly. A more gradual learning curve can be less frustrating, as you can move on to more advanced techniques with less difficulty.
「このゲームは学習曲線が急なので、チャレンジが好きな人におすすめだ。」
急な学習曲線は、基礎が簡単でも続けると急激に難しくなるということです。もっとゆるやかな学習曲線なら、難なく進めるので悔しい思いはしません。
