Rock Paper Scissors Simulation (pygame)

This is a simple, self-contained Rock–Paper–Scissors (RPS) world built with pygame. Agents (Rock, Paper, Scissors) move around the screen, bounce off edges, and convert each other on collision according to RPS rules. The simulation ends when only one species remains. Press R to restart.

Watch the Simulation on YouTube

Press the image below to watch or this link:

Features

• Object-oriented design with an Agent class
• Bouncing, organic movement with gentle random acceleration
• Collision conversion with cooldown
• HUD: species counts, FPS, elapsed time, centered title, and a win banner
• Optional PNG sprites (rock.png, paper.png, scissors.png); otherwise colored circles are used

Requirements

• Python 3.8+
• pygame (see requirements.txt)

Install

python -m venv .venv
# Windows PowerShell
.\.venv\Scripts\Activate.ps1
pip install -r requirements.txt

Run

python main.py

If rock.png, paper.png, and scissors.png exist in the same folder, they will be used automatically. Otherwise, the simulation draws colored circles.

Controls

• Esc or Q: Quit
• R: Restart simulation

Notes

• The simulation automatically pauses when one species remains and shows “X Wins!”
• Adjust parameters like population size, speeds, and cooldown near the top of main.py.