Portal

GLaDOS & Wheatley
The Weekly IRL: Valve Cosplay

This is some hardcore cosplay.(via)

Chell with Atlas and P-Body
The Weekly IRL: Valve Cosplay

Whoever's cosplaying Potato-GLaDOS is doing a GREAT job.(via)

The Cake
The Weekly IRL: Valve Cosplay

The only lie is its calorie count.(via)

Portal Turret
The Weekly IRL: Valve Cosplay

Even death-machines built to guard Aperture Science facilities need a makeover every now and then.(via)

Cave Johnson
The Weekly IRL: Valve Cosplay

You can see the desire for citrus-arson in his eyes.(via)

Left 4 Dead
Half-Life
Team Fortress 2