Galaxy Rally is a Special Game found in Mario Tennis Open. It is very similar to Gooper Blooper Volley from Mario Power Tennis for the Nintendo GameCube. It is played on the Galaxy Arena court. In this Special Game, players have to rebound the ball to Luma successfully a certain number of times. After the player serves, when the ball bounces on one of the four Shrinking Tiles on the court, that tile disappears, putting that section of the court temporarily out of play. The player loses a try if the ball falls through the open space and into the black hole below, the player fails to hit back the ball to the Luma, or the ball bounces outside the boundary line. After the player successfully rebounds the ball, the previous empty Shrinking Tile area is restored while another disappears.
Initially, one of the four Shrinking Tiles is missing. However, once 40 rebounds are made, two of the four Shrinking Tiles may be missing. And after 80 rebounds, three of the four Shrinking Tiles may be missing.
During the gameplay, there are Star Chips found on the visible Shrinking Tiles. If the ball intersects any of them, players can receive two coins while a section of the Launch Star meter is filled. For every consecutive intersection, the amount of coins a Star Chip gives increases by two. Once the player collects all five chips, a Launch Star is assembled. Once the ball collides with the Launch Star, the Launch Star gives the player five coins and moves to another visible Shrinking Tile. For every consecutive intersection, the amount of coins the Launch Star gives increases by five. After a while, the Launch Star's meter goes down until it is empty, making the Launch Star disappear and the Star Chips reappear. Collecting coins or Star Chips is not required to clear this Special Game.
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