FREE: Nintendo DS game

A little info I just found out, someone asked me if you can play the regular ds games on a 3ds....
Nintendo website states-
With the exception of a few games which require the use of the AGB slot, all Nintendo DS games are compatible with Nintendo 3DS family systems. However, some specific features or accessories that use the AGB slot are not compatible.Nintendo DS and Nintendo DSi games will display in a lower resolution than Nintendo 3DS games. There is no way to change this; however, if you wish to play them in their original resolution, hold down START or SELECT when loading the game.Nintendo DS and DSi games will not display in 3D.The HOME Menu cannot be accessed while playing Nintendo DS or DSi games.Nintendo DS or Nintendo DSi games are not compatible with StreetPass or SpotPass.Nintendo 3DS family systems cannot access any features or use any accessories that access Slot 2 on the Nintendo DS (Game Boy Advance game slot.)