RPSX is a 2-player abstract strategy game played on a 3x3 grid. Players take turns placing Rock, Paper, or Scissors chips onto the board. Chips can be stacked on top of existing chips, but only when the incoming chip beats the current top chip by rock-paper-scissors dominance (Rock beats Scissors, Scissors beats Paper, Paper beats Rock). Only the topmost chip in any cell counts toward board control and winning. There are two ways to win. A Soft Win is achieved by getting three chips of the same type in a row (row, column, or diagonal). A Hard Win is achieved by getting Rock, Paper, and Scissors each in a row — one of each type. The Hard Win cannot be blocked or countered. The advanced variant introduces on-board movement. Instead of placing a chip from their hand, a player may move a chip already on the board from one cell to another. Stacking rules apply on arrival. This mechanic is designed as a counterplay system: a player can use movement to change the top chip in a key cell, breaking an opponent's Soft Win line before it completes. Hard Wins remain unblockable in all variants.

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