Koopa Kingdom is NOT from Mario. It is just named after the enemies in the series, yet it does not include or mention them much. In the center there is Fort Bowser, a modified desert temple that has many secrets that you must find. There is also a rocky tomb, a secret underground arena, a cramped lounge, and a large amount of other secrets and entertaining creations ti explore. Go ahead, walk around. If you destroy this world, don't worry, nobody will take your blocky head off and keep it as a trophy. However, consequences will occur if credit is not given in other media such as videos. BE AWARE OF THAT!