I remember the challenge in the shadow room was to see who could jump the farthest off the ground when then light flashed. A bell went off to let you know it was about to go.
Was there ever a mirror maze in Hastings? For some reason I remember one, but I'm probably confusing it with some other park.
Could you be thinking of the Turvey Manor Fun House? That's one of those attractions that we know basically nothing about (hence the wiki page being empty). If you remember anything, it'd be great to hear about it in that thread.
I went a few times back in the days of Hastings, but I don't actually remember what it was like, though. I remember that Questor (sp?) thing, but that's it. I'd love to see photos of the place.
No, it wasn't the fun house. The two main things I remember from the fun house were the strobes in the room full of huge mushrooms and the rotating tunnel to get out.