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NAME

       lightup - puzzle game

SYNOPSIS

       lightup  [--generate  n]  [--print  wxh  [--with-solutions] [--scale n]
       [--colour]] [game-parameters|game-ID|random-seed]

       lightup --version

DESCRIPTION

       You have a grid of squares. Some are filled in black; some of the black
       squares  are  numbered. Your aim is to â.PP Each light bulb illuminates
       the square it is on, plus all squares in line with it  horizontally  or
       vertically unless a black square is blocking the way.

       To win the game, you must satisfy the following conditions:

                                                                         â.
              All non-black squares are lit.

                                                                         â.
              No light is lit by another light.

                                                                         â.
              All  numbered  black  squares have exactly that number of lights
              adjacent to them (in the four squares above, below, and  to  the
              side).

       Non-numbered  black  squares  may have any number of lights adjacent to
       them.

       Credit      for      this       puzzle       goes       to       Nikoli
       (http://www.nikoli.co.jp/puzzles/32/index-e.htm (beware of Flash)).

       Light Up was contributed to this collection by James Harvey.

Light Up controls

       Left-clicking in a non-black square will toggle the presence of a light
       in that square. Right-clicking in a non-black  square  toggles  a  mark
       there  to  aid solving; it can be used to highlight squares that cannot
       be lit, for example.

       You may not place a light in a marked square, nor place a mark in a lit
       square.

       The  game  will  highlight  obvious  errors in red. Lights lit by other
       lights are highlighted in this way, as are numbered  squares  which  do
       not (or cannot) have the right number of lights next to them.

       Thus,  the  grid  is  solved  when  all  non-black  squares have yellow
       highlights and there are no red lights.

       (All the actions described below are also available.)

Light Up parameters

       These parameters are available from the â.IP "Width,  Height"  Size  of
       grid in squares.

       %age of black squares
              Rough percentage of black squares in the grid.

              This is a hint rather than an instruction. If the grid generator
              is unable to generate a puzzle to this precise specification, it
              will increase the proportion of black squares until it can.

       Symmetry
              Allows you to specify the required symmetry of the black squares
              in the grid. (This does not affect the difficulty of the puzzles
              noticeably.)

       Difficulty
              â.SH "Common actions"
       These  actions are all available from the â.PP (On Mac OS X, to conform
       with local user interface standards, these actions are situated on  the
       â.IP "New game (âStarts a new game, with a random initial state.

       Restart game
              Resets  the  current  game  to  its  initial state. (This can be
              undone.)

       Load   Loads a saved game from a file on disk.

       Save   Saves the current state of your game to a file on disk.

              The Load and Save operations preserve your entire  game  history
              (so you can save, reload, and still Undo and Redo things you had
              done before saving).

       Print  Where supported (currently only on Windows), brings up a  dialog
              allowing  you  to  print an arbitrary number of puzzles randomly
              generated from the current parameters, optionally including  the
              current  puzzle. (Only for puzzles which make sense to print, of
 it’s hard to think of a sensible printable representation of Fifteen!)
              course â.IP "Undo (âUndoes a single move. (You  can  undo  moves
              back to the start of the session.)

       Râ, Ctrl+âRâ)                                                      Redo
       (â.
              Redoes a previously undone move.

       Copy   Copies the current state of your game to the clipboard  in  text
              format,  so that you can paste it into (say) an e-mail client or
              a web message board if you’re discussing the game  with  someone
              else. (Not all games support this feature.)

       Solve  Transforms  the puzzle instantly into its solved state. For some
              games (Cube) this feature is not supported at all because it  is
              of  no  particular  use.  For other games (such as Pattern), the
              solved state can be used to give you information, if  you  can’t
              see  how  a  solution can exist at all or you want to know where
              you made a mistake. For still other  games  (such  as  Sixteen),
              automatic  solution  tells  you  nothing about how to get to the
              solution, but it does provide a useful way to get there  quickly
              so   that   you   can   experiment   with  set-piece  moves  and
              transformations.

              Some games (such as Solo) are capable of solving a game  ID  you
              have  typed  in from elsewhere. Other games (such as Rectangles)
              cannot solve a game ID they didn’t  invent  themself,  but  when
              they  did  invent  the  game  ID  they know what the solution is
              already. Still other games (Pattern)  can  solve  some  external
              game IDs, but only if they aren’t too difficult.
              The â.RE

              Qâ,
              Ctrl+âQâ)
              Quit (â.
                     Closes the application entirely.

Specifying games with the game ID

       There  are  two  ways  to save a game specification out of a puzzle and
       recreate it later, or recreate it in somebody else’s copy of  the  same
       puzzle.
       The  â.PP  You  can  enter either of these pieces of text back into the
       program (via the same â.PP The difference between the two forms is that
       a  descriptive game ID is a literal description of the initial state of
       the game, whereas a random seed is just a piece of arbitrary text which
       was provided as input to the random number generator used to create the
       puzzle. This means that:

                                                                         â.
              Descriptive game IDs tend to be longer in many puzzles (although
              some,   such   as   Cube   (cube(6)),   only   need  very  short
              descriptions). So a random seed is often a quicker way  to  note
              down  the  puzzle  you’re  currently  playing,  or to tell it to
              somebody else so they can play the same one as you.

                                                                         â.
              Any text at all  is  a  valid  random  seed.  The  automatically
              generated  ones are fifteen-digit numbers, but anything will do;
              you can type in your full name, or a word you just made up,  and
              a  valid  puzzle  will be generated from it. This provides a way
              for two or more people to race to complete the same puzzle:  you
              think  of  a random seed, then everybody types it in at the same
              time, and nobody  has  an  advantage  due  to  having  seen  the
              generated puzzle before anybody else.

                                                                         â.
              It is often possible to convert puzzles from other sources (such
"
              as â.IP "âRandom seeds are not guaranteed to  produce  the  same
              result  if  you  use them with a different version of the puzzle
              program. This is because the  generation  algorithm  might  have
              been  improved  or  modified  in later versions of the code, and
              will therefore produce a different result when  given  the  same
              sequence  of  random  numbers.  Use a descriptive game ID if you
              aren’t sure that it will be used on  the  same  version  of  the
              program as yours.
              (Use the â.RE

              A  descriptive game ID starts with a piece of text which encodes
              the parameters of the current game (such  as  grid  size).  Then
              there  is  a  colon,  and  after  that is the description of the
              game’s initial state. A random seed starts with a similar string
              of  parameters,  but  then  it  contains a hash sign followed by
              arbitrary data.

              If you enter a descriptive game ID, the program will not be able
              to  show you the random seed which generated it, since it wasn’t
              generated from a random  seed.  If  you  enter  a  random  seed,
              however,  the  program  will be able to show you the descriptive
              game ID derived from that random seed.

              Note that the game parameter strings are  not  always  identical
              between  the  two forms. For some games, there will be parameter
              data provided with the random seed which is not included in  the
              descriptive  game ID. This is because that parameter information
              is only relevant  when  generating  puzzle  grids,  and  is  not
              important  when  playing them. Thus, for example, the difficulty
              level in Solo (solo(6)) is not mentioned in the descriptive game
              ID.

              These  additional parameters are also not set permanently if you
              type in a game ID. For example, suppose you  have  Solo  set  to
              â.SH  "The â.PP The â.PP The â.SH "Specifying game parameters on
              the command line"

              (This section does not apply to the Mac OS X version.)

              The games in this  collection  deliberately  do  not  ever  save
              information  on  to  the computer they run on: they have no high
              score tables and no saved preferences. (This is because I expect
              at least some people to play them at work, and those people will
              probably appreciate leaving as little evidence as possible!)

              However, if you do want to arrange for one  of  these  games  to
              default  to a particular set of parameters, you can specify them
              on the command line.

              The easiest way to do this is to set up the parameters you  want
              using the â.PP If you run the game with just that parameter text
              on the command line, it will start  up  with  the  settings  you
              specified.

Octahedronâ from the âTypeâ menu, and then go to the game ID selection, you will see a string of the form âo2x2#338686542711620â. Take only the part before the hash (âo2x2â), and start Cube with that text on the command line: âcube o2x2â.
              For  example:  if you run Cube (see cube(6)), select â.PP If you
              copy the entire game ID on to the command line,  the  game  will
              start  up  in  the  specific  game  that  was described. This is
              occasionally a more convenient way to start a particular game ID
              than by pasting it into the game ID selection box.
              (You  could  also retrieve the encoded game parameters using the
              â.SH "Unix command-line options"

              (This section only applies to the Unix port.)

              In addition to being able to  specify  game  parameters  on  the
              command line (see above), there are various other options:

              --game

              --load These options respectively determine whether the command-
                     line argument is treated as specifying game parameters or
                     a  save  file  to  load. Only one should be specified. If
                     neither of these options is specified, a  guess  is  made
                     based on the format of the argument.

              --generate n
                     If  this  option  is specified, instead of a puzzle being
                     displayed, a number  of  descriptive  game  IDs  will  be
                     invented  and  printed on standard output. This is useful
                     for gaining access  to  the  game  generation  algorithms
                     without necessarily using the frontend.

                     If  game  parameters  are  specified on the command-line,
                     they will be used to generate the game IDs;  otherwise  a
                     default set of parameters will be used.

                     The most common use of this option is in conjunction with
                     --print,  in  which  case  its  behaviour   is   slightly
                     different; see below.

              --print wxh
                     If  this  option  is specified, instead of a puzzle being
                     displayed,  a  printed  representation  of  one  or  more
                     unsolved   puzzles   is   sent  to  standard  output,  in
                     PostScript format.

                     On each page of puzzles, there will be  w  across  and  h
                     down.  If  there are more puzzles than wÃh, more than one
                     page will be printed.

                     If --generate has also been specified, the invented  game
                     IDs   will  be  used  to  generate  the  printed  output.
                     Otherwise, a list of game IDs  is  expected  on  standard
                     input  (which  can  be  descriptive  or random seeds; see
                     above), in the same format produced by --generate.

                     For example:

                     net --generate 12 --print 2x3 7x7w | lpr

                     will generate two pages of printed Net puzzles  (each  of
                     which will have a 7Ã7 wrapping grid), and pipe the output
                     to the lpr command, which on many systems will send  them
                     to an actual printer.

                     There  are  various  other options which affect printing;
                     see below.

              --save file-prefix [ --save-suffix file-suffix ]
                     If this option is specified, instead of  a  puzzle  being
                     displayed,  saved-game  files  for  one  or more unsolved
                     puzzles  are  written  to  files  constructed  from   the
                     supplied prefix and/or suffix.

                     If  --generate has also been specified, the invented game
                     IDs  will  be  used  to  generate  the  printed   output.
                     Otherwise,  a  list  of  game IDs is expected on standard
                     input (which can be  descriptive  or  random  seeds;  see
                     above), in the same format produced by --generate.

                     For example:

                     net --generate 12 --save game --save-suffix .sav

                     will  generate twelve Net saved-game files with the names
                     game0.sav to game11.sav.

              --version
                     Prints version  information  about  the  game,  and  then
                     quits.

              The  following  options  are  only meaningful if --print is also
              specified:

              --with-solutions
                     The set of pages filled with  unsolved  puzzles  will  be
                     followed by the solutions to those puzzles.

              --scale n
                     Adjusts  how  big  each  puzzle  is  when printed. Larger
                     numbers make puzzles bigger; the default is 1.0.

              --colour
                     Puzzles will be printed in colour, rather than  in  black
                     and white (if supported by the puzzle).

SEE ALSO

       Full documentation in /usr/share/doc/sgt‐puzzles/puzzles.txt.gz.