Celebrate in style with our Complete This Sudoku Birthday Card! This unique card, designed by Ohh Deer, is the perfect way to wish someone a happy birthday. Solve the puzzle on the front and reveal a secret message inside. A fun and thoughtful way to show them they are truly special! SKU ODGC10495 Size A6 Dimensions 152.0mm 112.0mm 1.5mm Finishes Debossed Envelope Coral Inside Message Blank