Double Fine Productions is working on four new downloadable games. Today, it’s been announced that two of those downloadable games will be published by THQ. The first has been revealed as Costume Quest, an adventure RPG that takes place on Halloween night. The second is a third-person adventure game coming sometime in 2011. Specifics on that have not yet been discussed.

In Costume Quest, players take on the role of young children who go out trick-or-treating on Halloween night. Throughout their night, players will collect candy, points, cards, stamps, and assignments from the neighborhood residents. These can be used to power up players in combat against monsters, where they’ll turn into larger versions of their costumes equipped with superpowers. Locations in the game include suburban neighborhoods, malls, and a carnival. Players will do all this in a quest to save their sister and be home before curfew.

“We wanted to make a big impression with these, our first downloadable games ever,” said CEO Tim Schafer. “So we are coming out swinging with two great adventures from two of the most creative minds in the company.”

Costume Quest is out this Halloween on PlayStation Network and Xbox LIVE Arcade.

Thanks, 1UP.