The HTMX 4.0 JavaScript library has been released exclusively on the Game Boy platform, allowing users to experience the power of HTMX on a portable handheld device. The release is accompanied by a Game Boy game that challenges players to collect pickles and defeat the final boss to unlock the HTMX 4.0 source code. The game was created using GBStudio and features four levels of pickle-collecting excitement. The release is a unique and nostalgic way to experience HTMX.