We know that the people at Valve have quite the sense of humor.  This year's summer sale has come and gone, but that leaves us with a fun little present: Valve shared with us all the fake video game key art and covers that were hidden inside Steam's massive digital catalog as part of a scavenger hunt style game. Valve developer Claire Hummel - who worked previously on games like Half-Life: Alyx and Westworld Awakening VR - created the images for all of the fake games that were hid...