Cube (Portal 2) - Valve Developer Community

prop_floor_ball_button - Valve Developer Community

Game portal, companion Cube, Chell, aperture Laboratories, GLaDOS

There's a fan-made N64 demake of Portal in the works

Portal Reloaded is the closest we're likely to get to Portal 3

Dropper (Portal 2) - Valve Developer Community

Portal 2 - Valve Developer Community

Half-Life 2 and Other Secrets in Code of New Portal Collection

Portal 2: Community Edition - Developer Q/A #3

Why in Portal with RTX Companion Cube looks just like in original

Dropper (Portal 2) - Valve Developer Community

Portal 2 - Xbox 360 : Video Games

Steam Community :: Guide :: PTI to Hammer