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Reflex Rally, is the seventh minigame from the Game Boy Advance game, Mario Tennis: Power Tour. This minigame helps Clay or Ace build up PS Response, which is beneficial to their Power Shots. The player plays rock-paper-scissors against a robot, appropriately called the R.P.S Mech. The robot's move appears on the screen and the player must use the correct move. Paper beats rock, rock beats scissors, and scissors beat paper. If the player chooses the correct move, a pot or a block will hit the robot. However, if the player chooses the losing move, they get hit with an object. For each level, the player gets sixty seconds to complete, but the amount of lives for the R.P.S. Mech varies.
Level 1: Beat the R.P.S. Mech 20 times within 60 seconds.
To promote Mario Tennis: Power Tour, the minigame was repurposed as an online Flash game that appeared under the name Mario Tennis: Power Tour -- Reflex Rally in the Nintendo Arcade, a section with promotional web games on Nintendo's official website. While this feature is no longer officially supported, it can still be accessed with digital archives.
From a gameplay standpoint, there are no major differences between the two versions, although the timer in the Flash version starts counting from 30 instead of 60 seconds as in the original minigame. There is also no set score to beat, and the player always controls Clay.