Sardinium is one of the most collectible that you need to collect, in-order to unlock new upgrades for your weapons and gears. Also, finding these items are not so easy you need to explore every single corner to find them.
Below we have listed all the Sardinium location in each section of the game, so you can find them easily.
Area 01: Tentakeel Outpost
The very first Sardinium is located in the small orange crate on the platform near the central Boss Kettle. Ink the wall of the nearby column, then squid-jump toward the platform to claim the Sardinium.
Lair 1: Return of the Octarians
Avoid vertically oriented launchpad, behind the Shielded Octotrooper, and collected the Sardinium located in the crate atop this platform. Ink and swim up the wall, careful to avoid making contact with the launchpad.
Lair 2: Welcome to Octopia
Ink this wooden wall and swim up to reach the top of this platform be careful to avoid contact with the launchpad. Here you find 3 orange crates containing Power Eggs and Sardinium.
Lair 3: Sunset Octocopter
After clearing the first area of Ink Pistons, shoot a crate on this isolated platform to reveal this lair’s Sardinium. Squid-jump toward the platform from this direction to retrieve it.
Area 02: Suction-Cup Lookout
This area’s Sardinium is stashed in a reinforced crate in the alley between Lairs 06 and 07. Destroy the four wooden crates concealing this alcove, then continually shoot the reinforced crate until it surrenders its treasure.
Lair 4: Enter the Octohurler
Sidestep the launchpad after encountering the first Rolonium bundles. Beyond the launchpad is a lower ledge holding two crates. Smack one of these crates to retrieve this lair’s Sardinium.
Lair 5: The Octopark
When riding the Ride Rails toward this platform, make sure you’re on the leftmost rail. This rail leads up to a ledge containing this lair’s Sardinium. If you miss it, consider restarting from the last checkpoint—there’s no other way up here.
Lair 6: Octozeppelin Invasion
This Sardinium is located at the mouth of an Octozeppelin base, just beyond a launchpad. Step forward off the moving Propeller and aim at a freshly spawned Octozeppelin, taking it out with your Hero Charger. Swim forward immediately through your ink, careful to avoid the launchpad, and grab the Sardinium. Quickly backtrack to the launchpad before the next Octozeppelin appears.
Lair 7: Back-Alley Cleanup
This lair’s Sardinium is stashed in a box on a glass cube. The walls of the cube can’t be inked, so you need to find another way up. Retrieving the nearby key unlocks a Ride Rail. Ride the Ride Rail down toward the cube. Leap off the end of the rail, flying though a squid ring, then land on the cube to retrieve the Sardinium.
Lair 8: Spinning Campground
Before advancing to the first launchpad, drop down to this large grated platform. Splat the three crates in the corner to reveal this lair’s Sardinium.
Lair 9: Octoling Strike
Reaching this Sardinium can be a bit dangerous, since it’s located right next to the Octoling spawn point. Move into this area quickly and ink the ground in the corner next to the bicycle. This causes a hidden crate to appear, which contains the lair’s Sardinium.
Area 03: Beaker’s Depot
The crate containing this area’s Sardinium is located on this tall pillar near Lair 13. Equip the Hero Charger and ride the nearby Propeller until you can see a Grapplink near this pillar. Shoot the Grapplink with the Hero Charger to access this platform. Next, ink the pillar near Lair 13 and swim to the top. From here you can hop across the pillars to retrieve the Sardinium.
Lair 10: Octoseeker Shakedown
Run past the launchpad leading to the Zapfish and destroy the two crates at the end of this short platform—the one on the right contains the level’s Sardinium. Move quickly to avoid getting splatted by the Octoseeker hovering above.
Lair 11: The Floating Garden
The Sardinium is located in a locked box on the final platform. The key to the box is carried by one of the many Tentakooks scurrying about the same platform. Either hunt down each Tentakook one by one, or use the Tenta Missiles special to eliminate multiple enemies at once.
Lair 12: Octo-Resort Spring
The Sardinium is stashed in a crate on this platform, near the first Flooder. You must sneak past the Flooder and ink the side of the platform before swimming to the top. Move quickly, as the Flooder is likely to respond to your intrusion.
Lair 13: Dancing Floors
This is located in a crate on a raised platform near the second launchpad. You must ink and negotiate a series of moving platforms to reach this area. Start by hitting the Ink Switch below to fully extend the moving platforms. Don’t expect to reach the Sardinium on your first attempt. Instead, focus on inking a path to the Sardinium, including the wall of the platform on which the collectible resides.
Inking a path across the moving platforms is important because you have to swim the entire way, before eventually jumping over to this inked wall.