When version 2.0 was released for Mario Tennis Aces, I noticed that Nintendo’s support article on how to update the game (which includes the changelog) also mentioned about not being able to play in LAN mode with users who had an older version. Since I didn’t remember anyone mentioning the code for LAN Mode in Aces, I tried to find it on Nintendo’s support section.
To my surprise, I didn’t find any article about that. The only articles I found where about all the other games where the info has already been shared through other means and it’s well known that these modes exist. But considering that the changelog article mentions about a LAN Mode and hoping that it isn’t just a mistake, I decided to search for the code that triggers it.
After trying pressing several buttons that are used in the other games’ code, I eventually got to trigger the option to play in LAN.
So, for anyone looking for it, here’s the code to enable LAN Mode in Mario Tennis Aces:
Hold Left Stick and then press L and R at the same time.
The L and R buttons don’t need to start being pressed at the same time, just that, at one point, they are held down at the same time.
Btw, the code also works in Swing Mode.
And just in case, here’s the code again but in a different format.
(While holding Left Stick) L + R