The Legend of Zelda: Breath of the Wild is a pretty immersive single player game where you're thrown into a massive world with little instruction. A lot of the game is using your survival instinct and brain to keep yourself alive and overcome obstacles like the deadly environment. Despite the world being filled with life, you're on your own for 99% of the game but a modder is looking to mod in a local co-op mode.
NeoGAF user Blam went into detail on the mode and said that it won't be in a fully playable state for roughly a year.
"Fooni on the REGN8 Discord server posted some pictures of a mod they are working for BoTW (CEMU) which will allow 2 people to play locally side by side.
They mention that this will most likely take a year or so to be finished or at least in a playable state. They have mentioned it works by changing the location of an NPC, and model swapping to link. Then sending all inputs through each game."
CEMU is a Wii U emulator so it's highly unlikely you'll see this implemented on the Nintendo Switch but if you have a friend you'd like to explore Hyrule with, this mod may be something you want to look into. The gameplay of Breath of the Wild is already incredibly remarkable, the thought of putting two players in that world to mess around with those mechanics is incredibly exciting. You can view some screenshots of the mod below.
The Legend of Zelda: Breath of the Wild is out now on Nintendo Switch and Wii U.