Keycards in Half-Life: Alyx Workshop Tools

I've been seeing several keycard puzzles in Half-Life: Alyx custom maps and having never created one I decided to play around with them and see what you needed to get one to work in a custom map. This tutorial goes over the basics and some interesting things you can use to unlock doors aside from keycards, like say headcrabs! Seriously though, pretty much any object can be used with a trigger to unlock a door. Be creative!

This tutorial is heavily based on a similar tutorial by Hosomi. I learn a lot from his YouTube page. Check out some of his other tutorials at:
   / @hosomi  

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