White Robots in a Row — Black, Dramatic

1920 × 1080

two robots in a tunnel

1280 × 1024

Spherical Robots in Space

1920 × 1080

Eye with Digital Overlay — Black, Dark, Mysterious

1680 × 1050

Planet and Moon in Space — Blue, Dramatic, Sunrise, Digital Art

1920 × 1080

Three Young Warriors — Blue, Dramatic

1024 × 768

Woman in Futuristic City — Gray

1920 × 1080

Twilight War logo with planet

1024 × 768

Portal logo on dark background

1192 × 670

Portal 2 title screen

1920 × 1080

Aperture Science Devices

2304 × 1728

Portal Gun from Aperture Science

1920 × 1200