Wetrix

Floor selection and background colors:
Finish all 16 practice rounds. This will unlock a "Floor"
options at the options menu.

Water
Hold C-Down or C-Up to lower or raise a whirlpool of water.
Keep hold either button and press the Analog-stick to move
the whirlpool across the water.


Green background color and different shapes:
Finish all modes except multiplayer and practice and reach an "OK" rank.

If you choose any mode (except practice mode) you should see a small
blue guy. Choose the blue guy and press a button to transform him into
a duck. Begin a game and the tedrads should be rectangular triangle,
and square shaped pieces.