Overseas Sega Master System to Mega Drive Converter Adapter This is a converter adapter that allows you to play overseas Sega Master System games on a Mega Drive console or Retro Freak. It is not compatible with domestic Mark III consoles due to the different cartridge shape. The item for sale is only the converter adapter shown in the images. The game cartridges, Retro Freak, other consoles, and Mega Drive console shown in the images are not included. Boot-up has been confirmed on Mega Drive 1 and Mega Drive 2 consoles. It was also recognized and installed without issue on Retro Freak, allowing for gameplay. It also worked with Everdrive-type devices on the actual console (see image 4). *While I have confirmed that it works on the listed consoles, I do not guarantee that it will work on your console. Obviously, I do not guarantee that all overseas Master System games will boot up. Older Mega Drive consoles may have difficulty booting up. In such cases, please take measures such as maintenance or trying a different game cartridge. I cannot provide any support for this. Newer compatible consoles or Retro Freak are more likely to read the games smoothly. It is also recommended as the Gear Converter for Retro Freak is not compatible with overseas Master System games. You can easily play overseas Master System games on your Mega Drive or Retro Freak. *Note: As shown in the images, boot-up has been 100% confirmed. Videos have also been recorded to prevent claims and swapping of items. If the game does not boot up, it is 100% due to the buyer's console or cartridge. Please troubleshoot the issue yourself by changing the console, performing maintenance, or changing the cartridge. There are multiple accounts that are copying this product description verbatim, but they are selling defective products without confirming boot-up. It is better not to buy from them. I recommend buying from me as I have thoroughly confirmed boot-up.