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So I beat this using checkpoints. Honestly, this is too hard.
Hannah jumps over one space occasionally. The air pocket with spikes above killed me soooo many times.
Also, water levels are really hard. There's less control. The traps are more harshly timed than your other levels.
That + water =

No,no,no. There is a technique. I will show you how someday.

In the part where the air pocket is under a spike, press up arrow to a part where there is no spike.

xxxw   wxxx^  zz( xxxwxxxx||||xx||xxxxxkxxxxx
xxw     wxx xxxx  xxw.xwwxxxxkxx^^xxxxxxxxxxx
xx       xx xxxx ^ < n   xx bbxxm xxxxxxxxxxx
xx       xx@xxwxxxxxxxxx[xx xxxxxmxxxxxxxxxxx

Then while still pressing up, press left and you will use to the air pocket without dying!

Having an entirely water-based cave can be annoying. Making objectives somewhat unclear can increase that. Making the passages narrow, thus making it easy to get stuck in terrain can make it frustrating. Putting lots of spikes in it can make everything worse.
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SOURCE

Yaya, didn't you ever learn to use MLA format?

Shos, Teh. "Hydrodynamics - Hannah and the Pirate Caves (HATPC) level by shos." The Interguild - A Multi-Game Level Database. Ed. Livio De La Cruz. N.p., 23 July 2010. Web. <http://www.interguild.org/levels/index.php?id=3125>;.

Where's the hanging indent?!?!!?

9/10 A-

Finaally beaten it. It was seriously really hard and took over several days. The traps were even cool, you like blocking passages. ;p But it was really hardly timed and difficult overall. About 20 minutes ago twice in a row I've gotten to the door but just touching the secret area leading to the room with the door I wasn't fast enough to get into it and I've lost all bubbles! The atmosphere got tense but then after about 50 tries I've just counted to 10 and beaten it on first try. Hah, a good way I guess. It was evil. ;p It was overall well done, with the difficulty I'm glad it wasn't longer and I feel like giving it a 7.6, took away a bit because of evil difficulty, but everything was pretty decent except it.

Umm.. Teo, should you go through the secret area first before getting the last treasure...?

I went through the secret area first and got the first treasure, then I came back to the beginning with having that treasure chest and went through the main way. I was talking about the secret area about 5 tiles from the door. I was twice near the door but ran out of bubbles just next to the secret area leading to the door room, heh. ;p Are you making a walkthrough of this?

I already have a walkthrough...