For me, one of the most frustrating things in Enter the Gungeon was opening the path to the second hidden area. Even though I knew there was something special about that room and there was something I needed to do, it took a while to find the solution. This holds true for the biggest secret in Dead Cells, something that is shockingly more complex than it seems, and really most of the special keys. With this in mind, this guide will tell you how to locate all the hidden keys in Dead Cells.
The Architect’s Key is one of the easiest to find, though it’s very easy to overlook it. What you need to do is, when you open the doorway to the underground section of the graveyard, start looking for a secret in one of the walls. Eventually you should come across one and sooner or later said secret will yield the key. This can be used to open the gate on the far right on the surface. Said room will also unlock the path to another blueprint, both of which are shown in the video below.
The clockwork key is a great example of having all the pieces but possibly never figuring out how to use them. In this case, the bells, which can be rung, need to be hit in a specific sequence in order to unlock the key. The order goes from softest to loudest. I strongly suggest trying to, if nothing else, figure out some of the order, since there are a total of 24 possible solution and simply knowing the first or last is enough to decrease it to 2. To further aid you, the video below will give you an idea of what the correct order sounds like.
The garden keys are a fantastic example of hiding the solution in plain sight. For most, the journey will likely begin when players see the odd flower behind a jumping puzzle or when they come across the doors preventing access to a blueprint. Players can get the jumping one by using the spider rune, with the second being hidden under a breakable floor (use the ram). As for the final one, towards the middle of the map there will be a flower that resembles the keys themselves that you can slam. If it’s the correct flower, there will be some brief dialogue and after enough hits the key will be unearthed.
As you might’ve guessed, the Moonflower puzzle is what I was referencing above. Even though you might come across the doors on the final level or one of the keys, the trick for obtaining all of them is far more complicated than one might think. Worst of all, the reward is easily one of the least useful perks in the game.
If that isn’t enough to scare you away, start by unlocking the third boss stem difficulty and set the game to that. From there, obtain all three Garden Keys and then continue to Ramparts. There you’ll find the first key, likely somewhere in the ceiling, with the required exit being behind a three boss cell door. This will lead to the other boss fight and give players access to the Graveyard and second key. Players then need to head to Forgotten Sepulcher, locate the third and final key, followed by defeating the next boss and heading to the last area. Somewhere there will be a hidden room with three doors, all of which require Moonflower Keys and the hardest blueprint. If this is confusing, the video below shows everything, including the reward for finishing this task.