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+- (Hudson Lacerda)

The goal of the game is to get points by moving the cursor in a
matrix. Each move accomplishes a sum or a subtraction of the involved
numbers (current and new). The result should be inside a valid range
(default is 0-10).

To move, use the keys:
     w e r
     s d f
     x c v

You can also use the numerical key pad to move. After a game, use
<SPACE> for a new game, or press 'q' to terminate the program.

For DOS users, there are a few .BAT files with predefined options (for
several game flavors). UNIX users can also run these files, provided
that they create a link or copy of +- under the name "mm".

mm3.bat is a good option to get started with.


COMMAND-LINE OPTIONS (replace - with + to disable):
-h   Help
-a   Alternate addition/subtraction each move (+a +A for random).
-A   Alternate addition/subtraction each two moves (+a +A for random).
-t<number>   Board size. Usage:
-c   Clear screen each turn (for DOS version; disable with +c)
-.   Matrix control. Usage:
    -.[[##]|[e]][r]
    Examples:
    -.    Visited cells are replaced with a dot.
    -.r   Visited cells are replaced with a dot, but still can be revisited.
    -.e   Start sparse, 50% empty cells (dots).
    -.30  Start sparse, 30% empty cells.
    -.03  Start sparse, 3% empty cells.
    -.33r Start sparse, 33% empty cells, can revisite cells.
-d   Enables diagonal move (default, use +d to disable).
-o   Obfuscate about 50% of the cells with '?'.
-m<number>   Max value for operations (default 10)
-p   One point for each succeeded move.
-P   Don't terminate on a failed operation, just take off 50% of the points.
-s<num>   Set pseudo-random numbers generator seed.