How do I make a teleporter work ONLY when all 4 sentries have been knocked out?

I know how to make it when one is knocked out, but what about 4?

Use a counter where the target number is 4, and wire each of the sentries to the counter saying “sentry knocked out → increment counter”, and have the counter open the teleporter once target number acheived.

What I did on one my maps recently was put the room with all the sentries in it, and then have a hallway connecting off of it with lasers, each one corresponding to a sentry.

Welcome to the forum @Dragon1!

I was gonna say the same thing:

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