If you're looking for a truly unique Halloween experience, look no further than Seattle Immersive Theatre's "Harvest" - a haunted house for adults. From their website:
You're invited to soak up some liquid courage at the Doctor's cocktail party before freely exploring Seattle's largest immersive experience of horror and intrigue. Choose your own path and test your bravery as you crawl beneath the skin of this gruesome open world conceived and directed by Ali el-Gasseir and designed by Seattle Immersive Theatre's award-winning Scenic Designer Paul Thomas along with a team of some of the city's most talented visual artists.
Visit www.seattleimmersivetheatre.com for more information and tickets.