My children have more than one Nintendo DS system. How do I find out which games they can play together if we just buy one copy of the game?

Many Nintendo DS games feature Single-Card Play, enabling wireless multiplayer activities even when only one player has a Game Card. The back of each retail game box displays the number of players the game supports and if the game can be played via Single-Card Play.

Note that Nintendo DS games that support Single-Card Play can be played with other Nintendo DS or Nintendo 3DS systems.