how do u get blue key in pool of rain? o! and chest.

Ah, how cute, especially for me. And a coincidence, as the last time I was on neoseeker was way back last year in august. But, haven't I answered that question before? In an earlier thread? If I haven't then of course I will tell you, but you know, all the people here answering questions are pretty busy themselves, and don't want to have to repeat themselves. Lol I might as well just tell you now...
Key:
1)From the beginning, head right and fall into the water. Swim to the
right until you reach a door that's right below a glass container (it looks
like a jar). Enter the door.
2)In the next room, jump out of the water and to the right. Avoid the
Flying Octopi and make your way to the far-right of the room. The Key should
be there.

Chest:
1)Head back left, and continue until you're at the far-left of the room.
Allow yourself to become Puffy Wario, and float to the upper-left (you'll
probably have to lead a Flying Octopus to the left). Once you hit the
ceiling, fall to the right and open the Chest.