'Rays' is a game in which the task is to uncover all hidden elements (treasures) in
as few steps as possible. There are 9 hidden treasures in a 10 by 10 field.
Use arrows to navigate the field. Press space-bar to uncover field. If this field has
treasure it will change its background color to red. Content of the field will also
show how many elements (hidden and/or uncovered) are within vertical and horizontal
lines intersecting at this field, as if rays been used to locate elements. Hence the
name of the game. To indicate these rays dots on these lines will change to crosses
(plus signs). You can also toggle mark '#' on yet uncovered field by pressing Enter.
This will not affect steps counter. You can use that mark to help yourself to
remember that certain field does not have any hidden treasures. If latter you
decided that you made mistake you can un-toggle by pressing Enter key once again.
Requirements
The game is written and tested for emacs 21.4.1 and should work on any
version of emacs 21.