Well, let's write walkthrough. Not full, but anyway. Kind off.
1) Simple, just tetris with objective.
2) You need to put 10 squares on the rock, and it will crack.
3) Every time you put any figure, fireball being dropped on your objective square. To prevent this, you need to protect it with your own squares.
4) The squares disappear not in horizontal line, but in 4 squares in line with same colour.
5) Disappear not horizontal. but vertical line)
6) You have a small clearance for your figures.
7) Your figures will fall down, if they are not attached to objective square.
8) Avoid the line.
9 - no idea.