Companion Cube with hearts

1200 × 960

Robotic Villain Character

1024 × 768

Galactic Football character art

1024 × 768

Halo 4 Spartan soldier

1600 × 900

Portal gun from Aperture Science

1200 × 750

Portal game icon

2622 × 3312

Portal Companion Cube

1280 × 1024

Actors in Lab Setting

1200 × 900

futuristic city at sunset

1600 × 1200

Portal 2 test chamber

1920 × 1080

Aperture Science workstation

1920 × 1080

Half-Life 2 Combine Soldiers

1200 × 960

Robot in Ruined City — Gray, Dramatic

1200 × 750

man with brain laboratory

1200 × 782

figure in cloak before glowing portal

1024 × 768

Robot in Laboratory

1200 × 960

Remember the Ishimura

1920 × 1200

soldier on alien planet

1600 × 1200

StarCraft II promotional art

3840 × 1080

Gas mask character in grid

1600 × 1000