It's a big day for the Mystery Inc. gang as the new Criminology Museum has opened up in Coolsville and there is an entire wing devoted to the gang's adventures. But something goes wrong when someone brings the costumes of those dastardly villains to life.
So now foes like Redbeard's Ghost, the Tar Monster and the Pterodactyl Ghost are on the loose throughout the city, and it is up to the young sleuths to stop these creature costumes and find out who is behind the plot.
There are over seven levels in Monsters Unleashed, each with their own objectives and clues. Upon completing a level, you will receive a score. Part of the fun of this game is going back and trying to beat your last rank. As you go through the game, you find more information concerning what exactly is going on. Though most of this knowledge comes from the cut scenes and not necessarily from gameplay, it is still an interesting story taken straight from the annals of Scooby Doodum.
In the Coolsville Criminology Museum, you will have to clean up the wrecked displays and, while you are doing that, you may find a clue or two. In the second level, Wickles Manor, you will go head to head with the Black Knight while later you will go to The Faux Ghost where many of the old baddies have gathered for some dancing and a few drinks.
There are several other levels that will take you across all of Coolsville, including the old clubhouse. You will also need to save pedestrians as the Pterodactyl Ghost flies down the streets looking for something to eat.