The arrow keys will move a tile adjacent to the space in the direction
indicated (moving the space in the \e{opposite} direction).
+Pressing \q{h} will make a suggested move. Pressing \q{h} enough
+times will solve the game, but it may scramble your progress while
+doing so.
+
(All the actions described in \k{common-actions} are also available.)
\H{fifteen-params} \I{parameters, for Fifteen}Fifteen parameters
pressing the space bar will lay a line between the two squares.
Repeating either action removes the domino or line.
+Pressing a number key will highlight all occurrences of that
+number. Pressing that number again will clear the highlighting. Up to two
+different numbers can be highlighted at any given time.
+
(All the actions described in \k{common-actions} are also available.)
\H{dominosa-parameters} \I{parameters, for Dominosa}Dominosa parameters
still be unique. The remaining levels require increasingly complex
reasoning to avoid having to backtrack.
+\dt \e{Multiplication only}
+
+\dd If this is enabled, all boxes will be multiplication boxes.
+With this rule, the puzzle is known as \q{Inshi No Heya}.
\C{towers} \i{Towers}