do u have to have an adult with you if you’re under 18?

From their site - Q: Is there an age requirement for admittance? A: Yes, a parent or guardian must accompany anyone under the age of 16. HellsGate Haunted House is not recommended for children under 12, but you know your child better than we do.

No you don't when I went it was a lot of kids in highschool there they didn't ask for ID so I would say no

I believe the age limit is 14 but you can message them to verify.