Gabe Newell's son Grey has revealed that the Valve boss once met with Nintendo in Japan to discuss a joint venture between the two companies which sadly went nowhere.
Speaking on a stream with Valve News Network, Grey casually revealed that he once got the chance to play Super Mario Galaxy with the legendary Shigeru Miyamoto during a trip he and his father made to Nintendo's HQ in Japan.
Grey explains that they were visiting Nintendo because “my dad was talking to him about some joint project. I think it was about the original Wii that ended up not happening." The "him" could be the late Nintendo president Satoru Iwata or Miyamoto himself; it isn't stated exactly.
At this point, the host stops Grey and ponders if this is something they're allowed to discuss in public, to which Newell Jr. replies: "This was like probably seven years ago. It was super casual."
We'll probably never know what this project was or if it ever got beyond the discussion stage, but having a company like Valve supporting Nintendo hardware back then could have made a huge difference, especially during the start of the Wii U era.