The smartest pet contest is just around the corner, and Nate the Great knows his dog Sludge is a sure winner. But just as they are getting ready to show off Sludge's brilliant tricks, the grand prize suddenly disappears. Without a prize, the whole contest will be a complete flop. Nate agrees to put his dog training on hold and take the case. It is a very tough puzzle to crack, and in more ways than one, it is a very fishy business. You will need to search high and low for clues leading to the missing trophy. Time is ticking down to the start of the competition. See if you can use your clever problem solving skills to help Nate and Sludge track down the prize before the contest is ruined forever.