Costume Quest is a party-based role-playing video game developed by Double Fine Productions and published by THQ on October 19, 2010. In the game, the player controls a child who is trick-or-treating with their twin on Halloween night when they encounter a monster that kidnaps their sibling. The player must travel around the local neighborhood collecting items for their costume, candy, and fellow children as companions in order to face the leader of the monsters and rescue their sibling. The costume aspects are used in turn-based battle segments, where the player character and companions are transformed into whatever they are dressed as to fight other monsters; the costume aspects are also used for abilities outside of battles. A DLC expansion titled "Grubbins on Ice", was released on December 21, 2010, taking place after the events of the original game and set in the monster world of Repugia. A sequel, Costume Quest 2, was released in 2014. Gameplay Costume Quest incorporates elements of exploration of adventure games and character growth of role-playing video games. In the exploration part of the game, the player character explores their surrounding area, starting with their neighborhood, then a mall, and then a country town. In these areas the player can complete quests through trick-or-treating that reward the character with hints to the sibling's location, more candy (a type of currency for interactions with other children), and costume parts that can be used to alter the character's costume. The character can also befriend up to 4 non-player characters that can help with some aspects of quest solving. At times, the player characters will encounter monsters, leading to the battle mode for the game. Here the children become giant versions of what costumes they are wearing, along with abilities reflected by that costume; for example, a child wearing a makeshift robot costume becomes a giant mechanized robot, while a child wearing a medieval sweater becomes a knight in armor and sword. Battles are turn-based, allowing the player to select attacks, blocks, or a special move that requires hitting a quick time event at the right moment to achieve maximum damage to their foes. Winning battles leads to additional rewards towards the player's main quest. Plot The game takes place on Halloween. Fraternal twin siblings Reynold and Wren are new in their neighborhood and are asked by their mom to make new friends in the neighborhood. The player