Portal: Forever Testing

Forever Testing is a Portal mod with four self-contained storylines. In the first, Chell travels into outer space after the events of Portal 2 to seek reconciliation with someone she left behind. In the second, a lone test subject in the 1990s undergoes an experiment supervised by what sounds like Cave Johnson — except this Cave Johnson is unexpectedly empathetic toward the cubes. In the third, GLaDOS allows Chell an elevator ride to the surface mid-test and follows every second of it. In the fourth, an alternate universe where Aperture uses entirely different chamber design principles introduces test subject 865 to a course built around automatic portals.