Portal

Portal is a cancelled film that was scheduled for a 2013 release with J.J. Abrams directing. It is based on the video game of the same name. In 2016, after some delays, Gabe Newell stated some news on the movie would be dropped soon, however it never did likely meaning it was cancelled. A movie based on Half-Life was also being worked on around this time, because both of these games are set in the same universe, it is likely that both these movies would have some connection.

Plot
The plot would be based on the video game.

Why It Was Cancelled

 * 1) The cancellation reasons are unknown.

Result

 * There haven't been any announcements about the film since it was first announced. So, it is unknown if it will be made or not.