Verified answer

It's where you can play multiplayer, with friends close to you, some games you only need one card, others you need 2.

if u have a friend and on that box has a symbol that shows only one game card needed than u can use the nintendo ds download to play against him or something

Actually is a feature from your DS that allows you to go to a "download station" like gamestop or at the video games section @ wal-mart to download the hottest new games(previews) available for your nintendo DS.

New Super Mario Bros. or Super Mario 64 DS

some of ur friends might have games tht u can download and play wiff them but some u have to have the game if u want to play wiff them