In DRAGON QUEST IX: Sentinels of the Starry Skies, players begin their adventure as guardian of a city who is sent to retrieve the fruits of a sacred tree that have the power to grant wishes. Players travel the world, conquer fearsome monsters and unravel an epic storyline. During their journey, players will encounter mighty opponents in fast-paced battles, and also interact with a colourful cast of characters.

DRAGON QUEST IX: Sentinels of the Starry Skies contains special modes that let players to share their adventure with others, allowing up to four players to team up via a local wireless connection and experience the fun of tackling challenging monsters and dungeons cooperatively with their own unique characters. Players can even leave the game active in their backpacks, pockets or purses and still interact with other players via an interactive "Canvassing Mode." Information about players' unique characters can be wirelessly transmitted to others, and treasure maps and customised greetings can be exchanged automatically by players who come within range of one another when their games are set to Canvassing Mode.