``` Main Quest 1: Climb to the top floor of the Tower of Choice.
Main Quest 2: Defeat the guardian on the top floor of the Tower of Choice.
Mission Time Limit: Twelve hours.
Mission Type: Cooperative Survival.
Mission Level: Tier B.
Mission Description: The Tower of Choice is a mysterious tower located at the border of time and space. It has seven layers in total. You are currently in the only room on the first floor. Once the mission begins, four doors will appear in the room, corresponding to the four rooms on the Second Floor: the Safe Room, Challenge Room, Monster Room, and Random Room.
Once a player enters a room, it will disappear after thirty minutes, destroying everything within it. Therefore, be sure to fulfill the room's conditions within thirty minutes and make the door to the next floor appear.
The conditions for making the doors appear in each type of room are described below.
Safe Room: Supplies and treatment will be provided upon entry. The door to the next floor will appear unconditionally.
Challenge Room: Upon entry, you must accept a challenge mission. After completing it, not only will the door to the next floor appear, but you can also obtain a temporary Treasure Tool (usable only in this mission).
Monster Room: Upon entry, you must kill the monsters in the room before the door to the next floor will appear.
Random Room: Upon entry, there will be only one door in the room, which will randomly lead to a room in the tower that has not yet disappeared.
Every room in the tower has only one entrance. Apart from Random Rooms and rooms on the Sixth Layer, each room has four exits. Once you enter a room, you cannot turn back. You can leave only