The game rules that cannot be changed are as follows: Your team bats first, and the Star Skills and mercy are turned on. There are four difficulty settings for challenge mode that are similar to those of "" - Mushroom (easy), Flower (medium), Star (hard), and Special (very hard). On Mushroom, Flower, and Star difficulty setting, four other teams are challenged for three innings. After each team has been beaten at least once, Bowser is played for five innings. On Special difficulty setting, the innings change so that each team is played with two additional innings from before. Once the player clears Special difficulty, then Bowser is selectable as a team captain. When using him as a team captain, the rules slightly change: The other teams invade Bowser's castle, and Bowser must beat them in a game of baseball to win his castle back. Bowser has to beat the initial five teams, then they come together to form a team of captains led by Mario that Bowser must defeat; Bowser can still recruit other characters, except the captains and sub-captains; and because Bowser Jr. is on his team, he does not wander the map to challenge a player, so you must play minigames to earn coins.