Silhouette of Robot and Cake — Blue

1366 × 768

Aperture Laboratories cake scene

1280 × 800

GLaDOS with apple and laser

1366 × 768

Aperture Laboratories logo with Companion Cube

1680 × 1050

Portal Game Logo — Black, Dark, Mysterious

2879 × 899

Portal Game Logo — Black, Neutral

1440 × 900

Portal title screen

1440 × 900

I don't hate you

1024 × 724

White Figure Running — Black

3840 × 1080

Portal art with character and robot

1440 × 900

Robotic Camera Device — Black

1920 × 1080

Valentine's Day with GLaDOS

1280 × 988