The Transitway is the 3rd level in the Mushroom Kingdom. Another grassy plain with signs of forest in the background, this is a recreation of World 1-1 in Super Mario Bros: The Lost Levels. The level is relatively short and easy. Mouser can be fought in a small cave as an optional boss in this level, located in one of the pipes of the level. Mouser, if no projectiles are handy, can be "bombed" by using its own bombs against him. He is easy compared to the later Mousers.