Yes, it does. There are Nintendo 3DS games that are exclusively for the 3DS family.
Yes, the Nintendo 3DS has its own selection of 3DS games that cannot be played on the DS or DSi
The 3DS has its own library of games, but can also play any games released on the DS or DSi.
Yes, the Nintendo 3DS (as well as the 3DS XL and 2dS) has its own 3DS games that will not work for the Nintendo DS, Nintendo DS Lite, Nintendo DSi, and Nintendo DSi XL.
The DSi downloads games from its own DSiShop, and the 3DS downloads games from its own eShop.
The 3DS has its own games that only work on that console because they're too advanced for the older ones. But it plays regular DS games too.
You buy ds or 3ds games and then put them in your 3ds.
No. The Nintendo 3DS has it's own selection of 3DS games but it can still play Nintendo DS and DSi games. Also, the Nintendo eShop has a Virtual Console which allows you to play games from the NES, N64 and GameBoy.
Access the 3DS eStore through the icon on the main menu. From here you can add funds to your wallet, purchase games, and download them. You can also redownload games you own but have deleted.
No, 3DS games can only be played on the 3DS.
Yes. The Nintendo 2DS is built to play 3DS games, so the mini cartridges are the same as those used on the 3DS. The 2DS does not have its own library of games separate from the 3DS.
Yes, the 3DS has games specifically designed for the system on cartridges and available through the eShop.
No. The 3DS is region locked, EU games will not work on a US 3DS.