Nature Challenge - Sea Creatures. The Nature Challenge Series introduces you to our planets most amazing wild animals. With superbly illustrated cards, discover the characteristics of the best-know species, as well as endangered ones. Each game contains 36 real-photo illustrated cards with original and stimulating facts and an introduction to protecting endangered species. Bet on the animals’ strengths and turn the situation around using your threatened species. At the end of the game, the player showing the strongest characteristic wins the other players’ cards. The first person to collect all of the cards wins the game. Made from recycled and recyclable materials.