-Draw lines along grid edges so as to divide the grid up into -regions. Every region should have two-way rotational symmetry, and -should contain exactly one dot which is in its centre. +Draw lines along grid edges so as to divide the grid up into connected +regions of squares. +
+Every region should have two-way rotational symmetry, should contain +exactly one dot which is in its centre, and should contain no lines +separating two of its own squares from each other. A region satisfying +all of these requirements will be automatically highlighted.
Click on a grid edge to add or remove a line. Right-click on a dot and drag the mouse to place an arrow in a grid square pointing to diff --git a/puzzles.but b/puzzles.but index 2c448b8..e22e63d 100644 --- a/puzzles.but +++ b/puzzles.but @@ -2400,10 +2400,15 @@ increasingly complex reasoning to avoid having to backtrack. \cfg{winhelp-topic}{games.galaxies} You have a rectangular grid containing a number of dots. Your aim is -to draw edges along the grid lines which divide the rectangle into -regions in such a way that every region is 180\u00b0{-degree} -rotationally symmetric, and contains exactly one dot which is -located at its centre of symmetry. +to partition the rectangle into connected regions of squares, in such +a way that every region is 180\u00b0{-degree} rotationally symmetric, +and contains exactly one dot which is located at its centre of +symmetry. + +To enter your solution, you draw lines along the grid edges to mark +the boundaries of the regions. The puzzle is complete when the marked +lines on the grid are precisely those that separate two squares +belonging to different regions. This puzzle was invented by \i{Nikoli} \k{nikoli-galaxies}, under the name \q{Tentai Show}; its name is commonly translated into @@ -2418,11 +2423,11 @@ Galaxies was contributed to this collection by James Harvey. \IM{Galaxies controls} controls, for Galaxies Left-click on any grid line to draw an edge if there isn't one -already, or to remove one if there is. When you create a valid -region (one which is closed, contains exactly one dot, is -180\u00b0{-degree} symmetric about that dot, and contains no -extraneous edges inside it) it will be highlighted automatically; so -your aim is to have the whole grid highlighted in that way. +already, or to remove one if there is. When you create a valid region +(one which is closed, contains exactly one dot, is 180\u00b0{-degree} +symmetric about that dot, and contains no extraneous edges between two +of its own squares), it will be highlighted automatically; so your aim +is to have the whole grid highlighted in that way. During solving, you might know that a particular grid square belongs to a specific dot, but not be sure of where the edges go and which