In line with Bethesda Softworks' "Fallout Shelter," the title has added two characters and new quests.

The "Fallout 4" Nuka World expansion includes Bottle and Cappy in the game, Phone Arena. The characters are derived from a bottle and cap, respectively. As per the publication, they are bound to appear in the players Vault, following the completion of the quest.

It is added that tapping on any of them gives Caps and Nuka-Cola Quantum to the player. According to Eurogamer, players can spend the items if they want to skip Quests or speed them up.

Bottle and Cappy are also set to appear in "Fallout Shelter's" initial "Special Event" Quest, which is accessible in the early game. Along with such Special Events and Holiday Quests, the title update is also set to include Weekly Quest, which refresh on Fridays. In addition, players can enjoy various regular quests, along with new daily missions.

"Fallout Shelter" is Bethesda's free mobile simulation video title. The game lets players construct, lead, and take care of their own Vault. They also guide the citizens of the Vault and aim to preserve the people's happiness through providing their basic needs, such as food, water, and power.

Bethesda Softworks' "Fallout Shelter" was initially released for Microsoft Windows, iOS, and Android in June 2015. 

Watch the trailer for "Fallout Shelter" here.