Bowser's Castle
Thomps are in the outfield of this ballpark.
Donkey Kong Jungle
This is a jungle that includes a river. In the river (which divides the infield and outfield), there is Klaptraps running around. They will bite and attach themselves to players that get too close. If they are hit by a ball, you will earn a team star. In the outfield, there is barrel blasters that will shoot barrels at players randomly during the game.
Mario Stadium
This is a basic baseball park. There is no obstacles or powerups on the field.
Peach Garden
This park is the garden of Princess Peach's castle. It includes various blocks that can be hit for team stars. The music from the original Super Mario Bros. is the theme song.
Wario Palace
This park is a desert. Chain Chomps are on the left and right field sides, they will attack anything that disturbs them. Another obstacle is storm generators that will blow the ball away. There is also team stars hidden in the sand.
Yoshi Park
This park is a grass field. It features Piranha Plants that will attack players that come too close. They will also eat the ball and spit it out somewhere else. If they are hit with a ball, they will produce a team star.