From the cover (translated): "Thomas is looking for his friends. Can you help him find Percy, Gordon, James and the other trains? Besides a good memory you need to be able to work together in this game to succeed. For only together will you be able to beat Diesel." Thomas needs to find his friends, and goes looking for them in various different stations, trying to avoid running into the mean Diesel. His friends need to be found in a particular order. If he runs into Diesel once too often (5 times), then the players lose. This is a cooperative game in which the players work together to try to defeat Diesel. They can help each other with remembering where the particular friend is whom they're looking for. This game involves memory, mainly, but it's as much a cooperative activity which makes for fun game-play.