These are truly the ultimate in hidden pictures. Jam-packed scenes on every page give hidden picture aficionados the ultimate challenge as they search for a checklist of items that are cleverly obscured within each spread. To add to the fun, each scene is also chock-full of visual jokes and humorous word balloons that will keep kids entertained for hours.   Whether diving for sunken treasure or swimming with the fish, this is the ultimate excursion under the water. There's more to watch for than just the whales, and there's more hidden beneath the waves than you've ever suspected!