When the wireless communication function of 3DS is turned on, the built-in street communication function of 3DS will also be turned on. In this way, when the 3DS is in standby, if there is another 3DS, and the owner also turns on the shoulder communication function of the 3DS, the two hosts will exchange some data. After rubbing shoulders, the built-in rubbing side of 3DS will show the Mii of the other side. You can open the details of Mii to view each other's information. At the same time, some games support the communication function of rubbing shoulders, which will produce interesting attachment content because of rubbing against other players. For example, Super Street Fighter 4 3D and Life and Death 3D can generate an AI with the same level as the opponent's player data to challenge, and Mario 3D Mainland will get other people's props after passing by. However, the two games built in Shoulder are completely designed by Shoulder Pass function.