I'm upto to floor 21. I sorta cheated, well I didn't - but floor 18-20 was driving me insane (I'd get up to the last challenger on floor 20 and die, it was so infuriating) so what I did was copied my best customized character three times and just used her as my three characters. It worked and I did it~

Critical finishes are my new favourites. I did them on some of the annoying characters on the Tower, it's a good way of killing them quickly maintaining your health.

I'm now attempting going down the tower~