I had been a fan of other simulation games and worked as an intern in a real zoo, so when Zoo Tycoon came out I knew I had to have it. I put off buying it and then came Dino Digs and Marine Mania. I wanted them all but didn't want to pay for each one seperately. I am now glad I was soooo cheap. Not only have they combined Zoo Tycoon with all of its expansion packs but they have added bonus materials. This is the ultimate combo pack of simulation games. I whole heartily recommend this to any simulation game fan.