Which Nintendo system did local multiplayer the best?

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I'll rank the home consoles (and Switch) based on how I think they did for local multiplayer.

1.  Wii - It was built from the ground up to be about local multiplayer first, and Wii Sports was bundled with the Wii in most regions.  Wii Play, Wii Sports Resort, Mario Kart Wii, and NSMB Wii are also great multiplayer titles.  Really the system was designed from the ground up to be the ultimate local multiplayer system.

2.  NES - It came bundled with 2 controllers and many bundles included the Zapper.  (Did you know Duck Hunt was a simultaneous multiplayer game?)  It also simply had a ton of local multiplayer games.  Not only did it have a ton of sports games, but it had top tier action/adventure games built around local multiplayer like Contra and Double Dragon 2.  A lot of what made the NES great for local multiplayer is that many arcade games were made for local multiplayer and the NES has lots of arcade ports.

3. SNES - It gets ranked #3 because it is a lot like the NES.  It came with 2 controllers, and it had a good amount of arcade ports.  Most importantly it had a 6-button controller for Street Fighter which was the top arcade game of this era.

4. Switch - Joycons are potentially 2 controllers in one (at least for some games).  The games that allow play with a single joycon get the most benefit from this: Mario Kart 8, SSBU, Puyo Puyo Tetris, Mario Party, etc....

5. N64 - First system to natively allow 4-player local multiplayer.  It deserves a lot of credit for this alone.  Also Mario Party and 3D Mario Kart started on the N64.

6.  Wii U - Mostly gets credit by inheriting the Wii remote and having some of the local multiplayer games that the Wii had (e.g. Mario Kart, Smash Bros., etc...).  A few games allow unique local multiplayer with the gamepad (e.g. Hyrule Warriors, Minecraft), but overall this feature was under utilized.

7.  Gamecube - One of these systems has to be in last place, but even the Gamecube had great local multiplayer like Mario Kart DoubleDash with 4 players.