Security fix for the ENLBufferPwn vulnerability.
Most community "reports" on Version 3.x refer to the massive from April 2020, which remains the game's final major content drop. My Thoughts On The 3.0 Update For Super Mario Maker 2!
The for Super Mario Maker 2 , released on November 14, 2022, was a technical maintenance patch primarily focused on security and stability. While it did not introduce new course parts, its most critical role was patching the ENLBufferPwn vulnerability , a high-risk security flaw that could allow remote code execution on a user's console during network multiplayer sessions. Technical Overview of Update 3.0.2 Release Date: November 14, 2022.
Nintendo briefly stated that "several issues have been addressed to improve the gameplay experience".