In the first area, a few crates have to be destroyed by a Sanitized Missile Octocopter's Tenta Missiles. Once these have been destroyed, a key can be collected to unlock a vault containing a launchpad which leads to the second checkpoint.
Checkpoint 2
In the second area, the Tenta Missiles have to hit an Ink Switch. This will move a platform used to proceed. Then missiles have to be dodged until the moving platform gets to another, larger area. Use the missiles to shrink a sponge. Under this are some grates that can fall through where the Glooga Dualies are found. Activate a ride rail to get back to the main area and get to the next part with some more sponges, climbing them leading to the third checkpoint.
Checkpoint 3
In the third area, there are a large group of sponges, which make up the floor. Climb up the sponges to get to the fourth and final checkpoint
Final Checkpoint
The final section involves moving a large platform with more Ink Switches. In the end, a wall can be swum up and leads to the area where the Missile Octocopter is. Once it is defeated, a launchpad will appear, leading to the goal.
Collectibles
Mem Cake
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Finality's not what it seems. When your end comes, rise up and run. Don't let defeat dissolve your dreams.