Costume Quest Download (2011 Role playing Game)

Players help a brother and sister defeat fiendish monsters who want to ruin Halloween in this offbeat RPG from the creator of Psychonauts and Brütal Legend. Gamers take on the role of Wren or Reynold as they go from house to house collecting candy, points, cards, battle stamps, and quest assignments in an attempt to rid the town of disturbing monsters.

The action takes players through the town of Fall Valley, from the Auburn Pines suburb, to the Autumn Haven Mall, to a creepy carnival, and gamers will accrue magical costumes, upgrades, and special items as they search for quests. Combat comes in the form of turn-based attacks, with the characters morphing from their cute Halloween costumes into oversized knights, ninjas, unicorns, vampires, and robots, and each outfit gives players unique special abilities.

How to run this game on modern Windows PC?

People who downloaded Costume Quest have also downloaded:
Cthulhu Saves the World, DeathSpank: Thongs of Virtue, DeathSpank, Call for Heroes: Pompolic Wars, Chantelise: A Tale of Two Sisters, Confrontation, Pink Panther, The: Hokus Pokus Pink, Darksiders II