Smell-O-Vision (scratch-and-sniff) cards for Nickelodeon's back-to-school promotional event (September 1999). Nine cards were available from Kraft mac-and-cheese boxes or Post cereal boxes, and accompanied episodes of The Wild Thornberrys, SpongeBob SquarePants, Rocket Power, and CatDog. The cards additionally doubled-up as a small puzzle. Puzzle 1 could be found in Post's Golden Crisp and Frosted Alpha-Bits boxes. Puzzle 2 could be found in Post's Marshmallow Alpha-Bits and Frostred Shredded Wheats boxes. Puzzle 3 was only available in Post's Honeycomb boxes.