Format for level files:

- name must be "level1_X.txt" (X = 1, 2, 3...)
- file must begin with a 9x9 matrix, that describes the tiles
- after the tile matrix, a number may be given that tells how many grenades are available in this level, 
- after this number, another number (between 0.0 and 1.0) may be given which describes the difficulty of the level: 0 = very easy, 1 = extremely difficult
- tiles are as follows:
 X = Box (can be exploded, moves)
 O = Ball (cannot be exploded, moves)
 B = Brick (can be exploded, does not move)
 S = Steel (cannot be exploded, does not move)
 : = Glass (can be exploded, moves, chicks can go through)
 . = Empty tile

 1 = 2-piece box left side (can be exploded, moves)
 2 = 2-piece box right side (can be exploded, moves)

Here's an example of a level file (not a good level, though):

--------------------------------------------
XXXXXBBXX
X.XX.X12X
X.XX.XSSX
XO.X:X..X
XOXX.XX.X
XOOX.XX.X
XSSX.XX.X
X..XXX.OX
XXXX.XXXX
5
0.2