A crowbar, a pair of glasses, and headcrabs, lots of creepy headcrabs. Back in 2004, Half-Life 2 made an indelible mark on a generation of gamers. Considered one of the most influential first-person shooters of all time, Half-Life 2 has earned over 30 Game of the Year Awards and a loyal legion of fans. A blend of story and gameplay, in a time when games were either or, Half-Life 2 changed the trajectory of games. And if that wasn’t enough, Valve allowed fans unprecedented access to mod the game, a move that further cemented its legacy in the gamer zeitgeist.