you select 3\by\.4 then the digits which go in your grid will be 1
to 9, plus \cq{a}, \cq{b} and \cq{c}.
-I first saw this puzzle in \i{Nikoli} \k{nikoli-solo}, although it's also
-been popularised by various newspapers under the name \q{\i{Sudoku}} or
-\q{Su Doku}.
+I first saw this puzzle in \i{Nikoli} \k{nikoli-solo}, although it's
+also been popularised by various newspapers under the name
+\q{Sudoku} or \q{Su Doku}. Howard Garns is considered the inventor
+of the modern form of the puzzle, and it was first published in
+\e{Dell Pencil Puzzles and Word Games}. A more elaborate treatment
+of the history of the puzzle can be found on Wikipedia
+\k{wikipedia-solo}.
\B{nikoli-solo} \W{http://www.nikoli.co.jp/puzzles/1/index_text-e.htm}\cw{http://www.nikoli.co.jp/puzzles/1/index_text-e.htm}
+\B{wikipedia-solo} \W{http://en.wikipedia.org/wiki/Sudoku}\cw{http://en.wikipedia.org/wiki/Sudoku}
+
\H{solo-controls} \I{controls, for Solo}Solo controls
To play Solo, simply click the mouse in any empty square and then
\dd Size of grid in squares.
-\dt \e{Recursion depth}
-
-\dd Determines how much guesswork and backtracking you will need to
-do to solve the puzzle. When this is set to zero (as it is for all
-of the \q{Easy} options in the menu), you should always be able to
-deduce the state of an edge without having to guess. If you increase
-it, you will have to guess more and more.
-
-\lcont{
-
-Setting a high value for this option is liable to consume a lot of
-CPU time and memory. Be warned!
+\dt \e{Difficulty}
-}
+\dd Controls the difficulty of the generated puzzle.
+\#{FIXME: what distinguishes Easy, Medium, and Hard? In particular,
+when are backtracking/guesswork required, if ever?}
\C{inertia} \i{Inertia}