Earlier this year, Valve asked James Lambert, the developer behind Portal 64, to stop work on the fan game. Instead, he's now making a brand-new Nintendo 64 game that seems to take a page from the cult classic co-op title that launched Helldivers developer Arrowhead Game Studios.
Valve's issue with Portal 64 stemmed from the fact that it used proprietary Nintendo development libraries, which had leaked ages ago but were never officially made public. Lambert has since moved over to open source alternatives, as he explains in the video below, but Valve seemed uncomfortable with the notion of porting Portal 64 because it wouldn't have a good way of tracking the project - and changing the foundation of the game would be a ton of extra work anyway.
