Yes, you can play UK games on a US Nintendo DS Lite. No DS game is region locked, the only difference is the online components may be different from country to country.
Yes, some DS Lite games will be compatible with the Nintendo 3 DS.
Yes, you can use ds lite games in the original Nintendo ds. They are not making new specialized games for the Nintendo ds lite. they are still making games that fit both the original DS and the Nintendo DS Lite.
yes you can its still the same
Yes you can play Nintendo DS games on a Nintendo ds lite.
Yes, the original Nintendo DS as well as the Nintendo DS lite can play NDSi games.
No, the DS lite does not use a memory card at all.
maybe?
yes i always do it
No the 3DS game cards are shaped slightly different then the Nintendo Ds. Of course if you could put the 3DS game cards in the Ds lite it would still not work because the features and intense graphics the nintendo 3DS requires for games can't be used on the Ds lite. Don't buy 3DS games for the Ds lite as it just won't work. You can consider buying a 3DS however as the 3DS is backwards compatible with all DS games.
yes they do
If you are asking if ds lite games will work in a sp the the answer is no.
no you can only use Nintendo games on Nintendo ds/Nintendo ds lite.