Thank you buttercupp.
I finally played coop_castle_day by removing original castle_day map.
However, I was a little disappointed at coop_castle_day.
I feel that there are not a dramatic story and an definite operations purpose like other coop maps in this map.
I received the impression playing TDM with AI entirely.
It is insipid.
1.Infiltrate the ennemy camp(need to kill 54 baddies)
I knocked down most of enemies.
However, I spent much time running about in map to find the last enemy when he hid and camped.
2.Hold the area(Stay inside castle and wait for them,need to kill 6