Halloween 2017 Event Re-Run/Free Quest/Csejte Castle

Castle Gates
Clear Chapter 7 to unlock

Underground Factory
Clear Mission No. 78 to unlock

Old Well
Clear Mission No. 81 to unlock

Food Cellar
Clear Mission No. 21 to unlock

Watchtower
Clear Mission No. 75 to unlock

Treasure Vault
Clear Mission No. 98 to unlock