Of corse it will The DSI is an upgraded version of the Original DS it will work.
Regular Nintendo DS games are not region locked, a UK one will work on a US DSi.
a DSi XL is larger in size than a regular DSi.
You will need Action Replay DSi - the regular Action Replay device will not work.
Yes, the Nintendo DS lite can play DSi games
Yes , any game made for the DS will be compatible with the DSi and DSi XL consoles
The game is for Nintendo DS. If your DSI machine will play DS games then you can. The game is not available in a Nintendo DSI game card. The game was only designed for the Nintendo DS platform, if it does not work on the DSI it is because it was designed for the Nintendo DS DS game
No, the DSi does not have a GBA port and so can't play GBA games.
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
No Nintendo DS games work on Nintendo DS game consoles and maybe some other Nintendo and not on any of the Xbox or PlayStation game consoles regardless of the country or region.
Yes most Nintendo DS games from the US will work on European Nintendo DS systems. However if the game is a DSI enhanced game then it will not work.
Nintendo DSi XL is defenitly better vecause it is bigger and has more applications on it, also its easier to log on to the internet on it.
all apart from action replay an action replay isn't a game