+==========================================================================================+
|DDiCI level format:                                                                       |
+==========================================================================================+

This is the level format for Dangerous Dave in Copyright Infringement (DDiCI) upon which the
Commander Keen (And indeed many ID Software games before 1992) are based.


+------------------------------------------------------------------------------------------+
|LEVELXX.DD2:                                                                              |
+------------------------------------------------------------------------------------------+

Level format is basically three sections; the header, which is a fixed size, followed by the
tile and sprite planes, which are of equal size. The level is word-based, meaning that each
'tile' in a level is represented by two bytes.

Most of the header is (Or was.) used by TED v1.5 to load the level and its associated graphics and is not used by Keen per se. These can be left blank and nobody will care, since
the original TED is long gone.


-------------------------------------------------------------------------------
FILE STRUCUTURE:
HEADER
TILE PLANE
SPRITE PLANE
-------------------------------------------------------------------------------

-------------------------------------------------------------------------------
DDICI LEVEL FORMAT:
------------------------------------------------
0   2    Lev height  Height of the level in tiles
2   2    Level width Width of level is tiles
4   2    Numplanes   Number of planes in level (2)
6   4    Blank       Blank
10  4    Ted var     2 TED 1.5 varaibles (Ignored by Keen)
14  2    Planesize   Level planesize; = 2(h * w) rounded to the next highest multiple of 16
                     bytes (So a level of 10x10 = 100 has a PS of 112)
20  16   Ted var     6 TED 1.5 variables, the first 1 byte long the rest 3 bytes. Notice
                     that the first byte of each of the last 5 variables is the same. (For
                     Keen 1 for example it is $FF)
36  2P   Tile plane  The tiles in  the level, [Planesize] entries of two-byte words, with
                     the 'padding' words being set at $00 $00 Thus the size of this block
                     is 2 * [Planesize] The level is filled in from top-left to bottom-
                     right, moving right across a row and down a row after reaching a
                     row's end.
~2P 2P   Sprite data Same as the tile data, but for sprites
------------------------------------------------
-------------------------------------------------------------------------------