It was said that “based on your circumstance, please try this battle with either 18 or 36 players.”
This suggests that you can only select from 2 difficulty levels.
As such, it will be difficult to succeed unless there are exactly 18 or 36 players.
My point is that if there are 19 players, the 18 player option is unavailable, so the 36 player option must be chosen. However, it would be difficult to complete content with difficulty set for 36 players with only 19 players.
I would like the difficulty set for each number of participating players between 18 and 36, for example if there are 19 players participating, the difficulty should be set for 19 players.
If there are only 2 difficulty levels, I am afraid that the content can only be enjoyed with exactly 18 or 36 players, which would make it difficult to casually gather players to try this content.