Chell Falling in a Test Chamber

1600 × 1200

White Spherical Robot — Curious

1024 × 768

Robot in a Puzzle Room

1280 × 1024

Blue Aperture Symbol

2560 × 1600

Portal game puzzle icons

1280 × 960

Turret Sentry Robot — Black, Dramatic

1152 × 864

Companion cube safety reminder

1600 × 1200

Turret Sentry Robot — Black, Dramatic, Digital Art

1920 × 1200

White Robot with Red Light — Gray, Minimalist, Digital Art, Red Heart

1680 × 1050

Turret Firing Laser

1920 × 1080

Robot Helmet with Glowing Lights — Black, Dramatic, Night, Digital Art, Glowing Red Lines

2560 × 1600

Man Putting on Gloves — Red

1440 × 900