Things You'll Need
Instructions
Single Game Connection
Examine the game's packaging. You will see two DS Lite icons. One will be black and the other white. This indicates that only one person needs to own the game for you to connect and play with them.
Turn off both DS Lites by pressing their respective "Power" buttons. If you own the game, you are the connection's "host." Insert the game cartridge into your system and turn both DS Lites on.
Select or download the game. If you are the host, use your plastic stylus to select the game you wish to play. For the connecting party, select the "Menu" option with your stylus and tap the panel labeled "DS Download Play." A screen will display, showing the available games to download. Select the game you wish to play. A confirmation note will appear. Select "Yes" to download the required data from your host.
Refer to your game's instructions. From this point on, the connection method is entirely dependent on a game-by-game basis. However, games generally have a "Multiplayer" option in their main menus. Another variation might be "Vs. Match" or "Competition." Basically, use your judgment. If the options imply something about playing against another person, this is likely what you will select.
Dual Game Connection
Look at the game's packaging. If both DS Lite owners require the game, the DS Lite icons will both be solid black.
Turn off both DS Lite systems via the "Power" button. Insert your identical game cartridges into your DS Lites and turn them on.
Select the game. Your desired game will appear on each of the systems' screens. Tap them with your styluses to start the games.
Refer to your game manuals. The setup procedure varies from game to game, but games usually employ buttons like "Multiplayer," "Match" or "Vs. Game" to indicate this feature.