: Whoops, I forgot. I meant the universal switch that opens all the gates at
: the same time.
Given your context, I figured as much. But you have something similar in Dark Star - just much more difficult to get, and more rewarding if found.
BTW, when it comes to A Converted Church, which is one of my altime favorite levels, of course I use the big secret but I still tend to fully explore the level anyway. The key to survival is finding the pattern buffer - once you find it, the rest is easy - well, not easy, but doable.