What are some games to play indoors at night [preferably with lights off] with about 15 people?

My church has lock-ins every so often with the youth (senior high). I’m just cool and stick around to play games.
We turn all the lights off in the three level church and play flashlight tag and sardines for most of the night. It’s a great time, but it gets repetitive.

What are some other games that we can play that are similar?
We have a regulation sized basketball court in our gym that can be used too, but we prefer the run-around-in-the-dark-until-you-hit-a-wall type games.