Computer Screens with Text

1600 × 1000

Stick Figures in a Lab

1600 × 1200

White Robot with Red Light — Gray

1280 × 800

White Robot with Red Light

1366 × 768

Chell with Robots — White, Dramatic

1920 × 1200

Portal Game Icons

1920 × 1200

White Robot with Blue Lights — Dark, Futuristic

1920 × 1080

P-Body Robot

1280 × 1024

Aperture Laboratories Logo — Black, Futuristic

1600 × 1200

Atlas and P-body robots

1366 × 768

Portal game ending screen

2464 × 900

Portal game title collage

1024 × 768