An engineer named Rich Fiore has turned the side of his house in the Chicago suburbs into a video game, just in time for Halloween.

“I’ve been working on this for about three weeks,” Fiore tells Inverse. “I knew Halloween was coming so I wanted to have something for the kids.”

Fiore used Unreal engine (which you can use to make an entire Starship Enterprise if you want) to develop the animation, and a hacked Wii controller turned very sci-fi-looking gun (“I didn’t want kids standing outside with a toy gun,” he adds.)

Fiore says his fascination with virtual reality spurred him onto the idea:

“I’m a big fan of the Oculus Rift and I was joking that the opposite of the Oculus would be projecting something everyone can see,” Fiore says. “So I started doing some projections and realized it’s something I could do. I thought it’d be fun for neighborhood parties, or corporate parties, or for haunted houses.”

What we see is a beta test of the game — he hopes to add spiders that will crawl on the ghosts, and people in the windows. “You’d be able to see what’s going on inside the house,” he says.

The video you see below was shot at around 3 a.m. about a week ago — nobody on Fiore’s street has seen the game in action — and it will make its official debut on Halloween night.

That is, if it stops raining in Chicago.

See also: This Augmented Reality Video Game Uses Your Bathtub Water as a Screen