This is an extension for the Mega Drive Mini inspired by the add-on part for accessing Master System games in the original console.
When Sega released the Sega Genesis Mini in North America and Mega Drive Mini worldwide on September 19, 2019, it also made the Mega Drive Tower Mini.
This extension is inspired by the Mega Adapter, which allowed the 16-bit Mega Drive to load cartridges and play games from its 8-bit predecessor, the Sega Master System.
The Mega Drive Mini Tower Zero will be available in Japan on October 21, 2021.