High Rollers is a Minigame Mode in Mario Party 9. This mode can be play with up to four players. In this mode players competes in a series of minigames to gain up to five hundred points by rolling their player block over the thirty, twenty, or ten panels. When a player rolls over a number panel, the amount of points it gives a player decreases by ten. When a panel reaches zero, Blue Toad increases the panel's value back to thirty.
How many moves the player haves depends on what place the player gets in the previous minigame. First place is allowed to move four panels, second place moves three, third place moves two, and last place only moves one. The minigames will be picked when the selected player stop the Minigame Wheel on a minigame. The player who picks is first be selected at random, then the succeeding choices are made by the player who finished last place in the last minigame. Any ties are settled by dice block rolls.
There is also a POW Space in the centre of the board. When a player rolls over the POW Space, every panel's point value is decreased by ten. If a block is at zero, then its value increases back to thirty. The POW Space can only be used by one player per turn, and is first active when everyone has taken their first turn.
Finally, when there is a 100 point gap in between players, the losing players gain a Boost item, which allows them to boost across the board, rolling over number panels and pushing off other players in their way, without using up a space to move. Players who are knocked off the board are unable to take their turn. When they do get a turn again, they land on the POW Space, activating it if it hasn't already.
The game ends when one player gets five hundred points or more.
 In-Game Description
"Play minigames to determine the order in which players roll around the board to pick up points. The first player to reach 500 points is the champion!"