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It's a Japanese game compatible with the Japanese Master System or Mark III, which uses a different sized cartridge than the overseas SMS. The Japanese Sega SG-1000 used this same size cartridge, and the Japanese SMS/MKIII were backwards compatible with them.
The Samsung Gam-Boy (South Korean version of the Master System) also used the Japanese-style cartridges.
In Japan, they used the "Gold Cartridge" branding for first-party releases and "Silver Cartridge" for third-party releases.
Thanks, I looked up the difference and this made things clear.
Were you looking at one of them online, or offline in a shop? If the former, do you have a link that might help ensure one's on the same page?
Here is an example:
The Japanese master system and mark III use a different size cart. You need an adapter (not sure if they are available).
Thanks, I looked up some pictures of the Japanese SMS and the slot is clearly different. Many thanks!