The Ghost of Christmas future is in hot pursuit of Shaggy and Scooby who are frantically trying to escape in a gondola.
As you make your way down the river, use the keyboard arrows to control the gondola. If you hit too many obstacles, the water will seep into the gondola and reduce your speed. When this happens, you must repetitiously tap the spacebar. Scooby will bail the water out using his red bucket. Do this until you can repair your gondola.
To finish the game, reach the end of the river without being caught by the ghost. On your way, you will catch power-ups that may help or harm you.