Apply ¼” redline tape to the narrow flap but do not remover liner paper just yet – this will be done last.
Stamp fallen snowman image on right hand side of larger piece of white cardstock with black ink. Draw a snowball in flight just above the snowman. Color images as desired.
Punch a small hole in right hand side of larger piece of white cardstock and add ribbon.
Position smaller piece of navy cardstock over left hand side of front image panel and tuck top and bottom edges to the back side through the slits. Place redline tape on top and bottom edges (back side) of navy panel.
To complete card, remove liner from tape at bottom edge of card and seal card edges.
When you pull the card, the navy piece on top slides from left to right to expose the hidden message and cover the first image.