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diff --git a/apps/plugins/puzzles/src/html/pattern.html b/apps/plugins/puzzles/src/html/pattern.html
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+Pattern
+<p>
+Fill in the grid with a pattern of black and white squares, so that
+the numbers in each row and column match the lengths of consecutive
+runs of black squares.
+<p>
+Left-click in a square to mark it black; right-click (or hold Ctrl
+while left-clicking) to mark it white. Click and drag along a row or
+column to mark multiple squares black or white at once. Middle-click
+(or hold Shift while left-clicking) to return a square to grey
+(meaning undecided): dragging like that can erase a whole rectangle,
+not just a row or column.