+==========================================================================================+
|Keen 1-3 tile property format:                                                            |
+==========================================================================================+

This covers the data segment that determines the properties of tiles in Keen 1-3. The
segment is stored in the executable at the following addresses:

Keen 1.31: $130F8
Keen 2.31: $17828
Keen 3.31: $198C8


The tile properties 'file' is internal, being stored in the executable. For the purposes
of this document we will treat it as an external file, 'TILES.TLI' (As can be done with
Tileinfo and patching.)

In a nutshell the file is divided into six 'planes'; each composed of two-byte entries. Each
plane covers a specific property of the tileset, such as animation frames, blocking-up or
general behavior.

The total size of the tile file is thus (tilenum * 12) bytes


-------------------------------------------------------------------------------
FILE STRUCTURE:
ANIMATION ENTRIES
...
..
.
BEAHVIOR ENTRIES
...
..
.
BLOCKING UP
...
..
.
BLOCKING RIGHT
...
..
.
BLOCKING DOWN
...
..
.
BLOCKING LEFT
...
..
.
-------------------------------------------------------------------------------

NOTES:


ANIMATION ENTRIES:

Values here are either 1, 2, or 4. (Any value not is rounded to 4.) When Keen reads a value
it skips the next (val-1) entries as 'the same' Thus if it reads a value of 2, it assumes
the next value is also 2. (And for 4, the next 3 values.)


BEHAVIOR ENTRIES:

This property is basically how a tile interacts with Keen; door, kills, etc. Valid values
are between 0-31 (And value higher is 'nothing') The following list describes what value
is what:

-2: Masked
-1: Foreground
00: Nothing        17: Exit
01: Kills          18: Key 1
02: Door 1         19: Key 2
03: Door 2         20: Key 3
04: Door 3         21: Key 4
05: Door 4         22: Message box popup
06: 500 points     23: Lightswitch
07: 100 points     24: Teleporter
08: 200 points     25: Switch on
09: 1000 points    26: Swtich off
10: 5000 points    27: Ankh
11: Joystick       28: Single bullet
12: Battery
13: Vaccum
14: Whiskey
15: Raygun
16: Pogo

Anything not used by an episode (Teleporters in Keen 2) will still attempt to call the
relevant code, causing errors.


BLOCKING ENTRIES:

The possible values here are 0, or not 0 (Usually 1) A value of 0 means Keen can move past
INTO  the x-or-y boundry of a tile (Its left side, bottom, etc) and a value of 1 means he is
stopped from doing so.

One way tiles are thus ones that let him OUT past a boundry, but not in. (But you already
knew that.) Top tile values and properties are as follows:

0: Fall through
1: Solid
2: Slippery
3: Ice