Portal Companion Collection brings together Valve's Portal and Portal 2, first-person puzzle games built around a device that creates linked portals through space. Players use it to solve increasingly elaborate spatial puzzles inside the Aperture Science labs.

The original introduces the core portal mechanic and its dryly sinister AI antagonist, while the sequel expands the puzzle design and adds a cooperative campaign for two players. Together they remain a benchmark for puzzle design built around a single clever idea.