Talk:Underground Treasure Chest - Easy 2/@comment-26984167-20160608030322/@comment-26044227-20160609221437

Depends on how quickly you want/need to finish the event. If you take advantage of every single free pass offered by the event, you probably only need an extra 10-20k to "finish" the event (barring any sword drops that are RNG rather than guaranteed based on the number of beads you have). I've seen people use up to 80-100k koban just because a sword they wanted wouldn't drop.