Blox Fruits Update 30 adds many hidden secrets for players to discover across the First Sea, and Marine Fortress has one of these secret activities. Unlike a normal quest, this secret requires you to interact with an NPC and complete a simple flagpole task.
The Marine Fortress secret is fairly easy once you know where to look. You need to find the NPC at the tower, collect a Rope from the nearby area, and use it on the flagpole. After completing the task, you can return to the NPC and receive Secret Levels as your reward.
What is The Secret in Marine Fortress?
The Marine Fortress secret starts with an NPC located at one of the towers in the area. Travel to Marine Fortress in the First Sea and look around the towers until you find the NPC. Talk to the NPC to receive instructions about putting a flag back onto the flagpole.
After speaking with the NPC, your next objective is to find a Rope. The Rope can be found somewhere around Marine Fortress, so you do not need to travel to another island. Search the nearby area and collect the Rope once you find it.
With the Rope in your inventory, head toward the flagpole located around Marine Fortress. Interact with the flagpole to use the Rope and start raising the flag. You will need to wait for a short period while the flag is being raised, so do not leave immediately after interacting with it.
Once the flag has successfully gone up, return to the tower where you found the NPC. Talk to the NPC again to finish the secret and receive your reward. The reward consists of Secret Levels, which are useful for the new progression system introduced in the update.
This secret is particularly useful for players trying to complete the First Sea secret progression. Since Secret Levels are connected to the new level system, finding and completing hidden activities like this can help you progress toward the higher level cap.
The Marine Fortress Flagpole secret is one of the simpler secrets to complete in Blox Fruits. You do not need to defeat a powerful boss or solve a complicated puzzle. The main challenge is simply finding the NPC, locating the Rope, and knowing where to use it.
Once you raise the flag, return to the NPC at the tower to complete the activity and claim your Secret Levels. If you are aiming to discover all of the First Sea secrets, make sure to add the Marine Fortress flagpole task to your progression list.