Looking at your map, I see you've uncovered the secrets behind the green and red portions of the map.
You seem to have only the white remaining. Am I correct? Ha! This mission seems way too easy.

Of course, it's only if I'm not mistaken, that is. But this map, the more I look at it, is poorly drawn!

Anyway, you must bring me some items in order for me to uncover the last secret of this map.

If you go to [map 103010000], you will see a yellow barricade where you will find portals that will lead you to different places. They're called Hidden Streets, and they're all over Maple World, so keep a close eye on them.

If you go there, you'll find a lot of Octopuses. Can you hunt them and collect 20 sacks of Ink? Stop asking questions--just do as I say! You don't have to go to the exact place I mentioned. It's just a suggestion as to where you can find a lot of Octopuses.

Weren't YOU the one that was curious?

Ah, you've finished collecting the Ink.

Let me make you what you need. It will only take a few seconds.

I can tell you now.

I'm not removing the white, but I'm spraying black to trace the lines to make out what's hiding underneath.

Open the Dirty Treasure Map and drag the Inc Sack over it.

Come back and see me when the map is complete.

Collect 20 sacks of Ink.