I think a horror game can still be scary with 1 to 4 people playing. That's it though. Nothing else.
May an idea where coop is done so everyone can do custom stories together. 4 people max though only.
A versus mode where it's 4 vs 4.. 4 people are survivors and others are hunters like said in another post.
Another Idea of a versus mode is 4 vs 1 or 2. A mode where 4 people survive and the other people control part of the AI as the Director. I think it'd be a unique experience. The AI director controlers can control the map from a sky view or another viewpoint (idk what would be best), and the goal can either be to invoke fear the most in the other players. They could set up a fear level indicator using the survivors microphone to detect words such as "oh my god, oh shit, i'm scared, ahh, etc..", heavy breaths, and also screams and such. They could take these variables and set them on different fear levels of their own. Whoever scares the other team the most wins. The teams would by 2's, while the 4 survivors will work together all the time though. Teams will only matter during the points and when the 2 people are the AI director. They could release a pulse indicator to measure how fast the heart is beating. Should be something simple that the player wheres around their neck or wrist and is wireless and attaches to the USB of their pc to detect fear as well. Oh and if the survivors survive, they get take pointz against the AI Director
. Or add points to themselves, either one. I think taking points from the AI director would make more sense, since they're in teams of two.
JUST AN IDEA