pressing space will also erase pencil marks.
As for Solo, the cursor keys can be used in conjunction with the digit
-keys to set numbers or pencil marks. You can also use the 'M' key to
-auto-fill every numeric hint, ready for removal as required, or the 'H'
+keys to set numbers or pencil marks. You can also use the \q{M} key to
+auto-fill every numeric hint, ready for removal as required, or the \q{H}
key to do the same but also to remove all obvious hints.
Alternatively, use the cursor keys to move the mark around the grid.
turns, you might mark the one way it \e{can't} go with a cross.)
Alternatively, use the cursor keys to move the cursor. Use the Enter
-key to begin and end keyboard `drag' operations. Use the Space,
+key to begin and end keyboard \q{drag} operations. Use the Space,
Escape or Backspace keys to cancel the drag. Or, hold Control while
dragging with the cursor keys to toggle segments as you move between
squares.