The 20 rule in gaming most frequently refers to a popular time-management and visual health guideline designed to prevent digital eye strain, fatigue, and repetitive stress injuries during extended gaming sessions. Commonly known as the 20-20-20 rule, it recommends that players take a mandatory break every twenty minutes to look at an object located at least twenty feet away for a minimum of twenty seconds, allowing eye muscles to relax from focusing intensely on a screen. Alternatively, within specific tactical shooter or resource-management strategy games, variations of a 20-percent resource allocation rule or pacing interval are utilized by competitive players to optimize tactical performance and stamina.