~ Or World of Warcraft for that matter. I came across this dialogue
Strong Bad: Hey, Hefty Bag, you ever play video games? Heavy: Just one. Strong Bad: Oh yeah? What tickles your fancy? Heavy: It is called... Tycho: WoW? Heavy: Niet! It is not popular. It is called "Where's an Egg?"
^ He probably doesn't know what WoW is. He probably thought it was a lame game since he never heard of it.
Actually, TF2 is currently in 1970's (It literally took place 40 years ago from now). Since TF2 uses a lot of advanced technologies the government used way before the world did, there could be a chance they had a hold of some sort of video game ahead of it's time. (Where's An Egg is obviously ahead of 1970)
But in all honesty, it was just a game invented in Russia that became popular in video games. --- "Why take the shortcut when you can take the long way?"
They also didn't have teleporters and machines that generate infinite amounts of health and ammunition in the 60s. >_>
Also, all four of the franchises in Poker Night at the Inventory have so little focus on continuity you can pretty much abide by the philosophy of "Everything, including Poker Night, is canon even if it makes no sense for it to be." --- We're whalers on the moon! We carry a harpoon! But there ain't no whales so we tell tall tales and sing our whaling tune!