RPS Arena takes the classic three-way relationship of Rock-Paper-Scissors and turns it into a real-time chaos simulator. You place units — rocks, papers, or scissors — on a large arena grid, and they move autonomously, hunting the type they beat while fleeing from the type that beats them. Rock chases Scissors; Scissors chases Paper; Paper chases Rock. A contact between predator and prey converts the prey to the predator's type. The arena ends when one type dominates 100% of the population.
In the default Player mode, you control one faction (your choice at the start) and can manually place up to three additional units of your type per 10-second cooldown. Your goal is survival and dominance: outmanoeuvre the other two factions, survive predator pressure, and convert enough enemies to tip the population balance. Strategic placement near dense enemy clusters creates conversion cascades that rapidly swing population percentages.
The game also includes a Simulation mode where all three factions are CPU-controlled and you simply watch the ecosystem play out — ideal for observing emergent dynamics. Populations naturally cycle rather than converging quickly; a dominant rock population depletes scissors, which allows paper to expand, which then hunts rock, which resets the cycle. These oscillating population dynamics create endlessly varied outcomes from identical starting conditions. Mobile-friendly with tap-to-place controls and a generous canvas that scrolls on portrait-mode phones.
A single conversion can trigger a cascade if your units immediately surround the newly converted enemy before it flees. Place units in a triangular formation — centre converts and flanks convert the reaction immediately.
If you're Rock, your primary threat is Paper. But Paper is hunted by Scissors. Allow a Scissors surge by not converting Scissors early — use Scissors as a proxy army to deplete Paper before engaging Paper yourself.
Units bounce off the arena edge. Herding your prey type into a corner removes their escape vectors and concentrates conversions. Edge-hunting is far more efficient than open-field pursuit.