gordon freeman, hl2, half-life, halflife, counter-strike, hl mod, blue shift, headcrabs, head crabs, crowbar, tools, hazmat suit, hazardous materials suit, scientist, Black Mesa, Sierra games, First Person Shooter icons, FPS icons, Gordon Freeman avatars, Gordon Freeman icons, Gordon Freeman pixel art, Gordon Freeman forum avatars, Gordon Freeman AOL Buddy Icons, Half-Life icons, Half-Life pixel art