Floating Sponge Garden

Floating Sponge Garden is the fifth mission in single-player mode, Octo Valley. It is named as such because of its heavy use of Sponge Blocks.

Octo Valley
After the player clears The Mighty Octostomp!, they gain access to Area 2 via an Inkrail. To access this level walk up right into a large crater on the ground and shoot the invisible kettle to enter.

Beginning
Jump down and spray the Sponge Block until it is as large as possible and then swim up it.

There are two Octopods so shoot them and spray another sponge, then swim up.

There are two Octotroopers behind a wall. Shoot them to reach a checkpoint.

Checkpoint 1
Spray the sponge and swim up to see another sponge to swim up, but this time an Octotrooper is waiting on a platform above.When it turns around, swim up and shoot it and a box containing Power Eggs and continue up two more sponges and a Launch pad.

Checkpoint 2
Jump down and spray the ramp for some more Power Eggs and swim through the fence to see two Octoballs. Simply spray the ground in front of them so they are stuck and shoot them while they're in your own paint to kill them. Swim up another sponge and shoot a vertical wall with more Power Eggs, swimming up it to progress.

Checkpoint 3
There are three sponges in a line, and then three more Octoballs. Use the same method as before to dispose of them. Shoot down a balloon with more Eggs and use the Launchpad that will only appear after all three Octoballs are gone.

Checkpoint 4
Either dispose of the two Octopods or quickly swim up the sponge before they can blow it up. There is another inkable vertical wall that is being guarded by two more Octotroopers. Either shoot them first or shoot the wall and go past them to reach another (jump pad?).

Checkpoint 5
There are 6 sponges in front of you and 3 Octocopters. You're gonna want to spray each Sponge Block and once you get to the second row of two sponges one of the Octocopters will take notice of you and come closer. Shoot it as soon as possible and by then the other two must've noticed and take them out as well. When you reach the third row with three Sponge Blocks, there are two walls with an Octotrooper strolling behind them. Spray an area where it isn't looking at, jump over, and take it out. Shoot and swim up the ramp with more eggs.

Final Checkpoint
There is an Ink Cannon to swim into and five Sponge Blocks are visible, four of which have Octotroopers on them and two Octocopters.Just shoot at your heart's content and once all enemies are gone and each block is large enough, spray the floor beneath you near one of the blocks and swim jump onto the block and each remaining block until you've reached your Zapfish.

Sunken Scroll
"The Terrifying Biology of the Inkling! Strength: Can leap up to 5 feet. Brain: Simple and predatory. Bones: None! Eyes: Can spot prey from 100 yd. away. Defense: High-pressure, high-capacity ink sack."

- Sunken Scroll greem

Location: At the fourth checkpoint, under the already inflated sponge. Let the two roaming enemies hit it or alternatively let the Octotroopers ahead of the sponge shoot it. After it deflates, drop through the net and get the scroll.

Quotes
Cap'n Cuttlefish:

Development
In one of the trailers showing off Splatoon's single-player mode, a slightly different version of this level was shown to audiences.