While various fan-translated versions and patches have circulated since the game's release, a "2021 patch" usually refers to one of the following:
Since Flash is no longer supported by modern browsers, these patches often include a built-in player or "wrapper" that allows the game to run on Windows 10 or 11 without needing external plugins. hizashi no naka no riaru uncensored patch 2021
: Focuses on slow, rhythmic movements to build a "cum state" for an internal finish. hizashi no naka no riaru uncensored patch 2021