They often involve being trapped, like in the riddle of the room with no exit. Trapped situations are inherently scary. It makes you feel the helplessness of the character in the riddle.
One horror story could be about a haunted mirror. In the '7 second riddles horror story', there might be a mirror that shows a different, terrifying face every time someone looks into it for 7 seconds. It drives people mad as they keep seeing these grotesque images and can't escape the mirror's curse.
There was one about a man who wakes up in a room with no windows or doors, just a mirror and a table. The answer was that he looked in the mirror to see what he saw, took the saw and cut the table in half. Two halves make a whole, and he climbed out through the hole. It's scary because it makes you think about being trapped in such a strange and claustrophobic situation.
The isolation of the characters. When a character is alone in a spooky place, like an old attic or a deserted forest, they are more vulnerable. In the '7 second riddles horror stories', this is often used. The character has no one to turn to when the horror starts to unfold, and they have to face it all by themselves, which is a really scary situation.
Yes, death is a common theme. Riddles often lead to revelations about death, either past murders or impending doom. For example, a riddle could be about a place where people have died mysteriously, and solving it uncovers more about those deaths.
Well, it could be a curious child. The child is always exploring and ends up getting involved in the horror of the '7 second riddles'. Maybe they are the ones who first encounter the strange and terrifying things.
The isolation in many of the Seven Second Riddles horror stories is quite frightening. For instance, when a character is alone in an old building or a forest and has to face these seven - second challenges. There's no one to help, and they are completely on their own against whatever horror awaits them in that short time frame.
The unexpected twists are really scary. For example, when you think a character is safe, suddenly something really bad happens to them. It catches you off - guard.
One story could be about a haunted mirror. A girl noticed in the mirror that there was always a figure behind her, but when she turned around, there was nothing. Every time she looked back at the mirror, the figure got closer and closer until one day she saw its face, a distorted and terrifying visage. And then she vanished, leaving only the mirror with a dark shadow inside it.
By their suddenness. In just seven seconds, a riddle pops up or something strange happens. It gives no time for the mind to prepare, like a sudden jump scare in a movie.