Yes, the Nintendo DSi can play Nintendo DS games. The NDS and NDSi are compatible with each other and can link for multiplayer as well. There are really no such thing as 'DSi games' except for DSi-ware and one or two games that require the DSi camera, none of which are compatible with a DS.
However, since the DSi has no GBA slot, Game Boy Advance games and DS games that require this slot (e.g. Guitar Hero: On Tour) cannot be played on a DSi. Flash carts and unofficial hardware won't work either, but there may be a newer version available, designed for the DSi.
Another problem you might find is that if you have any Wi-fi capable games, they will only work with a WEP security enabled network (or of course a network without security), not WPA.
Yes, the original Nintendo DS as well as the Nintendo DS lite can play NDSi games.
For the most part, yes you can. If you want to connect with pictochat or DS games (including DS Download), you can connect between a Nintendo DS and DSi. However, for DSi specific games, such as DSi games and certain applications, the Nintendo DS will not be able to connect. But, note that certain DSiWare games that can DS download play still can be connected to the Nintendo DS.
You can download unlimited, full version Nintendo DS and DSi games and easily transfer them to your DS / DSi using: http://www.squidoo.com/Download-DS-Games
The Nintendo 3DS will be able to play Nintendo DS and DSi games but games published for the Nintendo 3DS will not be compatible with those systems.
DSi Ware games and other downloadable content The Nintendo DSi Shop is specific to the region for which the system was manufactured. For example, a Japanese system can download DSi Ware games and other software only from the Nintendo DSi Shop for the Japanese region, regardless of where the system is being played. Nintendo DSi exclusive game cards Nintendo DSi game cards that are only compatible with Nintendo DSi and Nintendo DSi XL (and not Nintendo DS or Nintendo DS Lite) are region locked. This means game cards manufactured for the U.S. market would not work in a system made for another country. Nintendo DS / Nintendo DS Lite game cards Older Nintendo DS and DS Lite software is region-free, so you can play most of that software on a Nintendo DSi and Nintendo DSi XL from any region. It's possible, however, that future Nintendo DS software will incorporate region encoding. In these instances, these games would not work in a system made for another country. Source: http://www.nintendo.com/consumer/systems/dsi/en_na/faq.jsp#vers
they all play the same type dsi play ds games
if the artwork on the box say DSI you can not play it on a Nintendo ds, but, there are only a handful of games that say this
Yes, the original Nintendo DS as well as the Nintendo DS lite can play NDSi games.
you can play Nintendo DS games on a Nintendo DSi (i suppose this was what you meant with DS you)
well then u can play ds games but no game boy ur wellcome
yes all ds ds lite and dsi games are the same
Yes it can there aren't games that only work for dsi
Yes
if you mean the dsi then yes. however you cannot play 3ds games on the ds C.A.W
if you mean downloadable games (DSIware), no. But if you are talking about physical games,there is no distinction between dsi games and ds games.
Some games cannot be played on thedsi if they are for the dslite, or regular ds. Like if you see Nintendo ds games that say" available for Nintendo ds lite and Nintendo dsi". Nintendo are working on making games for the dsi too.
What are you talking about? Pokemon games are played in Nintendo DS' or Nintendo DSi and Nintendo DSi XL. The games avalible are Pokemon Heartgold, Pokemon Soulsilver, Pokemon Pearl, and Pokemon Dimond, these games are played on the Nintendo DSi, DS, and Nintendo DSi XL. You can also play games online, Play on the official site, Pokemon.com.