The elements in the four corners of this Level randomly change each time you load the game.
There is always a line blaster and locked block in each corner, plus two balloons and two bombs.
It helps a lot if the balloons are different colors.
The game only works if the line blasters and locked blocks are positioned so you can remove enough with them, plus the colored blocks in the centre of the board need to be favorable.
Work slowly and plan your moves.
If things are not working, just quit and try again - this level needs a lot of lives
The main thing to remember is to always save one of the lower line blasters for removing the metal block.