Splatoon 3/Boxes Locked! Keys, Please!

Boxes Locked! Keys, Please! is the 3rd level in Splatoon 3 's story mode, Return of the Mammalians. It introduces the keys and vaults feature into the game.

First Checkpoint
When you start, you see a large amount of crates in front of you. Break them all, and move forward. You will see a vault with an ink rail in it. Go around it and break the box. Grab the key inside, and open the vault by standing near it. Use the ink rail to swim across.

Jump off of the ink rail and you'll reach the Final Checkpoint.