How to Defeat Gooper Blooper in Super Mario Sunshine

Steps

Go to one of the levels where you fight Gooper Blooper: "Gooper Blooper Breaks Out", or "Gooper Blooper Returns".

There are slightly different tactics for each level he's in. Look at the sections below.

Gooper Blooper Breaks Out

Go to the area that has many multi-colored crates, shown in the introduction to the level. You can watch some YouTube videos if you are struggling to find out where Gooper Blooper is.

You should see a tentacle sticking out from the crates. Grab this tentacle with B, and stretch it so much so that it breaks from Gooper's body.

Now, Gooper Blooper will appear. First, wash its' face clean with FLUDD.

The tactic to defeating him is to pull out all 4 tentacles out from its body. To do this, first you must flatten them by jumping on them. Then, pull out that tentacle so it rips from his body.

Lastly, pull his nose to defeat him the first time.

After getting flattened, the blooper will be back a second time! All you have to do is repeat Step 4 and 5 and you will have defeated him for this level. Don't get your hopes up, he comes back in another level.

Gooper Blooper Returns

Gooper is back, and uses the same tactics as the first time! This time, though, you battle him in a different place. If you are having trouble finding him, use YouTube videos.

Once you have found him, spray water on its face with FLUDD to get the grime off.

To defeat him this time, it is still similar to before, just tear off all four of his tentacles, grabbing them with B, and then pull his nose.

After doing this once, he comes back for more, just like last time. Except this time, he will spray ink all over the stage. Wash it away with FLUDD.

Repeat Step 3 again to defeat him and get the Shine Sprite.