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Evens: Cells marked with gray squares must contain even digits.

Extra Region: The first eighteen digits of π (314159265358979323), read as column-row coordinate pairs (c3r1, c4r1, etc.), form an extra region on the grid. Digits may not repeat within this region.

Pi Boxes: Shade two 3×3 areas anywhere in the grid where the first nine digits of π appear in sequence, read row by row or column by column. The sequence may be oriented in any direction (e.g., left-to-right top-to-bottom, right-to-left bottom-to-top, etc.).

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