Sound Voltex II: Infinite Infection is a multiplayer rhythm game in which players interact with a variety of musical notes and patterns to score points and progress through songs. In this game, the setting revolves around a futuristic arcade environment where players can select from a wide array of songs across multiple categories, including original BEMANI tracks, VOCALOID songs, and licensed music, with data such as scores and unlocked content carried over from previous versions. It stands out with its innovative gameplay mechanics, such as hold notes on short buttons, non-hold notes on long buttons, and the introduction of the INFINITE difficulty level, which features rainbow-hued charts similar to challenge modes in other rhythm games, along with advanced features like BPM x HI-SPEED adjustments and a redesigned song selection interface.