From the press release:
The Gut-Busting Game that’s a Blast! Gassy Gus is the hilarious game that’s a blast for all ages! Players use cards to “feed” Gus all sorts of gaseous foods – from broccoli to baked beans. With each tasty dish players must pump up Gus and watch his belly grow bigger and bigger. Watch out for the big blast of “gas”! You never know when Gus will have a blow-out and give you a stinky penalty. Be the first to feed Gus all your food and win!