Portal gun firing a fire portal

800 × 640

Portal game logo and cube

1920 × 1200

Portal robots in a test chamber

1920 × 1200

Portal AI spheres

1280 × 800

Two men at a futuristic portal

1600 × 900

Companion Cube with hearts

1920 × 1200

Thinking with Portals

1280 × 1024

Weighted Companion Cube

1280 × 1024

Companion Cube with hearts

1440 × 900

Crowbar in case of headcrab infestation

1600 × 1000

Thinking with Portals

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Portal 2 Companion Cube

1600 × 1000

Companion Cube with hearts

1200 × 960

Ninjas in portals

1280 × 1024

The Cake is a Lie

1440 × 900

Ninjas in portals

1280 × 800

sci-fi battle scene

1600 × 1000

Aperture Science entrance

1280 × 1024

Final Fantasy XII characters

1280 × 1024

StarCraft game artwork

1024 × 768