Portal 2

Portal 2 is a 2011 first-person puzzle game developed by Valve, expanding on its predecessor with a full-length single-player campaign and a separate two-player cooperative mode. Chell awakens after a long stasis in the ruined, overgrown Aperture Science facility and must once again outwit its AI overseers, aided and hindered by the bumbling personality core Wheatley.

The sequel introduced a wealth of new mechanics, such as hard-light bridges, tractor funnels, aerial faith plates and colored gels that make surfaces bouncy, fast or portal-friendly, deepening the portal-based puzzling considerably. Its ambitious story, sharp humor, memorable voice performances and a standout cooperative campaign, featuring two robots and its own dedicated set of chambers, broadened the experience significantly beyond the original.

Widely regarded as one of the greatest puzzle games ever made, Portal 2 earned acclaim for its writing, level design and production values. It remains readily available on digital storefronts and continues to attract new players through its enduring co-op mode.