Collect the diamonds, and avoid the falling rocks!
Along the way, you'll encounter these elements:

Titanium Wall An indestructable wall
Dirt You can dig through dirt, leaving empty spaces
Brick Wall This wall can be destroyed if, say, you blow up
 a firefly next to it
Magic Wall Just as destructable as the Brick Wall. If you
drop a rock into the Magic Wall, it turns into a
diamond. If you drop a diamond, it becomes a
 rock. There has to be an empty space under
the Magic Wall, or else the falling rock or
 diamond will be swallowed by the wall and lost
 forever.
Firefly Moves clockwise. If you smash it with a rock
or diamond, it explodes. Deadly to the touch.
Butterfly Moves counterclockwise. If you smash it with
 a rock or a diamond, it explodes into diamonds.
 Also deadly to the touch.
Amoeba Grows randomly. If you suffocate it so it has
 no place to grow, all of the amoeba will turn
 into diamonds. Amoeba is not deadly to the
 touch (so you can help suffocate an amoeba
by standing next to it), but will kill fireflies or
 butterflies that touch it.
Closed Exit When you collect the required number of
diamonds, this will turn into an Opened Exit.
Opened Exit Passage to the next level.

At any time during the game, you can press ESC or hit
 Restart if you become hopelessly stuck. If you hold the
SHIFT key while moving in any direction, you will affect
the element in that direction without actually moving
 there. Therefore, you can clear dirt, move a rock, or
collect a diamond while standing still.

You may move to the previous and next levels using
the buttons provided, but your score will only be
 permanently recorded when you successfully complete
a level.