Talk:Tower-Type Event/@comment-3125054-20170901045408/@comment-25853921-20170901072208

you'd want to save your crystals for when you've already unlocked adv/ext since they give way more passes, unless you've got so many crystals that you think you cant finish using them by the end of the event (which is highly unlikely)

ultimately your rank depends on the floor you've reached, not how fast you reach the floors. you have 15 days to do it, which is more than enough time to spend all your crystals even if you dont use any to reach adv/ext. just keep using the method where you charge your bp to max right before accepting a rune to enter rune time and it should be fairly easy to reach adv/ext anyway.