The game itself is slow, the arena is locked behind characters who dominate it, and the gacha... you're better off (if you are free-to-play) saving 24k gems in the span of a couple months because this is the worst gacha I have seen (WHY 200 PULLS WHY?????) even for a regular 3*. The given reason of "probability" is just atrocious and infuriating but I shouldn't expect any less of Nexon (Creators of pay to get anything nice).