– The region. This is a PAL cartridge (as opposed to USA/Japan). It will only work on a European DS or a region-free device.
Here is the breakdown of what that string of terms means for a physical DS cartridge:
– The base game.
This is a very specific and highly niche collectible variant of Mario Kart DS .
If you own this cartridge, you have a legitimate piece of Nintendo's retail history. If you are looking to buy one, ensure the seller provides photos of the cartridge label, back serial, and a boot screen.
– This is not a full retail game. It contains a limited slice of the game (usually 8 playable characters, 4-8 tracks, and time limit per play).