Researchers continually face challenges finding ways to test the fundamentals of psychology: affect, behavior, and cognition. Since 2000, researchers have used a universal tool called Cyberball to investigate these outcomes. Cyberball is a virtual ball-toss game played with computer-controlled players. We updated the Cyberball paradigm, creating CyberballOS (Open Source), to make it require no special resources, have easy-to-set-up games, and record behavioral data. In addition, we developed CyberballOS as open-source software, making its code transparent, accessible, and extendable, which enhances reproducibility of findings and enables limitless program modifications. In this tutorial, we provide an overview of CyberballOS and instructions on how to create a new game, how to load a previous game, and where to find detailed help. We illustrate the process, step by step, for configuring a game (e.g., characteristics of the players, who the computer-controlled players throw to) for both typical use cases (with ready-to-go presets) and newer, more advanced CyberballOS features (e.g., the participant and other players being able to leave). To implement CyberballOS easily, we incorporated a critical feature: the ability to integrate CyberballOS into the popular online survey platform, Qualtrics (including collecting gameplay data). To demonstrate CyberballOSâs utility and how to use its features, we highlight three example studies based on research from developmental, social, and cognitive psychology. Ultimately, the goal is for researchers to easily and dependably work with CyberballOS to meet their needs and better understand affect, behavior, and cognition across psychology disciplines.