My best score was 295.
I choosed level 13 difficulty (x4).
But after the 1st boss, it didn’t continue like previous time… (Time left ~13-14min).
And my hi-score (= last score) was 396.
But I didn’t received the 300 reward. I’m 100% sure about that (there were no reward windows resumé at the end of the fight).
I think it’s bug.
EDIT: I replay arena, twice:
- Difficulty x1: Again, fight stopped at end of 1st phase.
- Difficulty x4:Fight stopped at end of 2nd phase. Got the book for 400 score. Everything was ok