Yes, it works with any kind of old DS game that requires mic.
No, 3DS games only work on the 3DS and 3DS XL as well as the 2DS
Yes, dsi games works on the 3DS also DS games work on the 3DS.
Yes. In fact, it will have additional functionality on the 3DS and the DSi series
No, they only work on the 3DS platform. But, you can play DSi and DS games on your 3DS.
Regular DS games from the UK will work on a 3DS from any region, including the US. It is only the 3DS games that are region locked, so a UK 3DS game would not work.
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.
You need an Action Replay 3DS, other versions won't work on it - note that it is built to work on regular DS games, there isn't a device for actual 3DS games yet.
The Nintendo 3DS is backwards compatible with Nintendo DS titles, so all DS Pokemon games and subsequent 3DS Pokemon games will work on the 3DS.
All DS games work on both the DS and the DS Lite. Games that require a GBA cartridge slot (like the Guitar Hero games) do not work on the DSi, as the GBA slot has been removed. also dont try 3ds games on any ds ( but 3ds) it wont work but you can play ds games on it :( but not 3d
Yes, you can use it for all previous DS games.
yes but 3ds games don't work on a ds lite
NO.