Hi, I'm looking for info on the compatibility of the "Gold Cartridge" with regards to the Master System. I was looking at one of these and it says on the box that it's made for the Mark III and Master System. However, the form factor is different than other Master System cartridges, and it's also nothing like a Sega Card. I've been looking for information online, but to my surprise I'm not coming up with any answers.

Are the Gold Cartridges compatible with (EU) Master System consoles? Do they fit in the cartridge slot?