Check out this Final Site (Rocket) guide in Splatoon 3. Includes how to get to the Final Site, the things you should know before the challenge, and the guides for each stage.
To challenge the Final Site, you need to defeat the bosses in Area 2, Area 4, and Area 6. After the completion, go to Squid Sisters Camp and talk to Agent 2, you will get an option to challenge the Final Site. Even if you haven't completed all the stages, you can challenge as long as you defeat the bosses.
Can't Enhance Your Equipments After You Enter the Final Site
When you enter into the Final Site, you can't enhance your equipments anymore. It is possible to complete the site even if you don't upgrade the equipments to the maximum, but it will be easier if you enhance it as much as possible. Smallfry is especially useful in some stages, strengthen it if you can.
Once you return to the camp, the progress at the Final Site will be reset. You can skip the stage you cleared once, but the story progression will start from the beginning. Therefore, let's challenge it after upgrading the equipments enough.
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Splatoon 3 Wiki Guide
Hero Mode Walkthrough
Post Hero Mode Contents
Hero Gear Upgrade
All Sardiniums
All Sunken Scrolls
