Related to laboratory work area

Half-Life game title screen

1280 × 1024

Portal Gun Firing

1680 × 1050

Half-Life 2 Episode Two menu

1600 × 1200

Anticitizen One incursion

1131 × 707

Half-Life 2: Combine

1280 × 1024

Robotic Arm in Lab — Gray

1920 × 1080

Space Station on Asteroid — Black

1545 × 600

Spaceships in Orbit — Blue, Dramatic, Night, Digital Art, Planet, Space Station, Moon

1600 × 1200

Silhouette of a Person — Black, Dramatic, Digital Art, Red Stripe, White Silhouette

1920 × 1080

First-person View of Portal Gun

1440 × 900

Person Entering Portal

1500 × 1000

Person on Skyscraper Edge — Blue, Dramatic, Afternoon, Digital Art, Yellow Case

1200 × 750

Person Falling into Portal — Blue, Dramatic, Digital Art, Arrow, Circle

1680 × 1050

Person Falling into Portal — Blue, Dramatic, Digital Art

1500 × 1000

Chell with portal device

1920 × 1080

Portal character with portal gun

1920 × 1200

Man in Glasses and Vest — Black

1280 × 960

Gordon Freeman Walking — Gray

1280 × 1024

Two Characters in Futuristic Armor — Gray, Dramatic

1600 × 1000

Woman Holding Portal Gun — White, Dramatic, Digital Art

1680 × 1050

Portal Gun Device — Gray

1600 × 900

Space Station Orbiting Planet — Blue, Dramatic, Night, Digital Art, Stars, Spaceship

1280 × 1024

Space Station Above Planet — Blue, Dramatic, Night, Digital Art

1280 × 1024

Man with Glasses in Game

1280 × 1024