By the time you reach the mission 'Deep Secrets of the Earth' in Horizon: Zero Dawn, you'll have overcome plenty of challenges already. Getting through these ruins, though, takes more than just fighting some machines and clambering up walls. The ruins of the Zero Dawn facility contain holo-locks that need to be set to the correct combination in order to open, and technical difficulties make it hard to tell if you're doing it right.
Related: Horizon Zero Dawn - How To Find All Ancient Vessels
If you're frustrated with the door puzzles in this vital delve, read on to find out what details you might be missing, so you can proceed.
Next: Horizon Zero Dawn - All Vantage Locations
Why am I writing this when I could be playing OlliOlli World?
Read more on thegamer.com