Several versions of Nintendo DS gaming console have been sold over the years, Original DS (NDS), DS Lite, DSi, DSi XL and now NDS 3DS. You can buy the games for current versions of these consoles separately, which is usually very expensive (unless you buy used games in lots). Alternately, you can download games from the web (paid or free) but you will need to buy a flashcard separately. Most popular flashcards include r4i Gold, r4-SDHC, etc and can be used very easily. Note: If you want to use these flashcards, don't forget that nintendo releases new updates from time to time to block these flashcards.