The SNES mini is a replica of the original Super Nintendo console but considerably smaller. There is a slot for game carts on the too based on the pictures I have seen. Will original game carts from the SNES fit and work into the SNES mini?
Although the mini SNES has a slot for game carts it is locked shut. You are unable to open it up to put anything inside. Even if it were possible to put something inside, the SNES mini is too small to fit the original game carts.
For the moment at least, it is not possible to use SNES game carts with the SNES mini. The games are are on the console when you buy it are all it will have.