I just found a bug, i think... it made me laugh out loud just because it feels so absurd. Just finishing a pretty good Darkness run on Twisted paths, i'm on round 499 (Challenge) and while it's still going I press Next to start round 500. My Shadow ends up killing the Horseman before the Challenge. I guess since there was still a creep on the field, it didn't consider the round "done". Anyway, i'm stuck looking at the round 500 screen. All the creeps are dead, but it's not progressing to the bonus round.