memorable

I'm a child, and I'm going to a large city park with a group of friends and oir parents. There's a big playground and grassy field, all near the city library. A comfortable place overall.
We eventually start playing games like tag and manhunt, and begin to split up. Before I know it, I'm in this grassy area with small, dilapidated houses, shipping containers and toppled buses acting as shelters and tunnels. Most of them are charred black, and there's lots of splintered wood and corrugated metal. It feels like a shantytown, but it still seems to be in the park and viewed as safe.
I'm playing alone and trying to avoid the others, but I feel an overwhelming sense of hostility and paranoia growing in the air, and become more fearful as I engage in the activities children do.
I'm entering the houses and containers, and at a couple points I see candy lying around and take it. I can feel the other children looking for me as I do this, but they've grown into something more... sinister.
At one point I have to crawl through a small, dark tin tunnel with a dog that alternates between whimpering and growling at something behind us, in the house. I crawl to the end toward the house's exit and hug the dog, but I'm pretty sure it gets caught by whatever is hunting us.
The dream now has a Silent Hill vibe. I'm not sure if it's still a game. I somehow find out how the other kids have been dying. They get their heads ripped off and replaced with a baby doll's head, or their head gets put on an animal or another person. Then they become sinister.
I grow increasingly terrified, and though I can't find anyone, I know that I'm surrounded by pieces of their corpses.
The playground is now empty, cloudy and plagued by weeds. I find two adults and we go back to the houses and tins as they demand to know who caused all this chaos, as if they think we're still kids. We wander to a dead end and there are dark, open windows all around us. I'm waiting for someone to reach out from one and grab them, dragging them into the window. I'm not sure if it happens.

The last part of the dream show the Scooby Doo gang from the original cartoons, standing and making plans to investigate that area. The sound is fuzzy, as if I'm watching them on an old TV. It seems like a normal episode, happy like it seemed with me, but it will definitely become dark and depressing.
The title tune--the one that plays when they display the name of the episode--is playing fuzzily in the background, and I know they're going to die.