Tunic offers a large world to explore. It is filled with dangerous enemies, secrets, puzzles, and more. It is up to you, the player, to explore as you see fit, but some areas are gated. For instance, the Ruined Atoll area has a locked door that you need a key to open.
To open the locked door in the Ruined Atoll area, you need to find the Ruined Atoll key. The Ruined Atoll key can be found in the top-right section of the map in this area. We have marked this location on the map below with a red star.
How to get the Ruined Atoll key in Tunic
To get the Ruined Atoll key, make your way to the northeast island in the top-right corner of the map. Once you get there, you can walk around the tall spire. This will reveal a secret area, and you will see the Ruined Atoll key lying on the ground.
Pick up the key and return to the locked door. You can then insert the key into the door and open a new path to explore the Ruined Atoll area. This allows you to move to new areas in Ruined Atoll.
For more information on Tunic, check out How to defeat the Garden Knight in Tunic and How to increase stats in Tunic on GameTips.PRO.