Players: 6 - 6
Civil War is similar to both Beer Pong and Nemesis, as it's a 3v3 format drinking game involving shooting ping pong balls into cups of beer. Each players has a 3 or 6 cup lifeline, and shoots balls in a rapid fashion at their choice of the opposing team player's cups.
Two teams of 3 face each other from across the table. Each player has their own 3 or 6 cup lifeline, arranged in the 3-2-1 triangle format. 2 water cups per team is recommended, as this game is much more fun (and faster paced) if beer is used inside the cups, although it is optional that a player use water as long as they drink for each cup made.
Civil War is probably my favorite drinking game, given its competitive, fast-paced nature. It's probably best suited for when you're renting a spot in Myrtle Beach, SC, getting hammered at 2pm in the afternoon with your boys. That being said, here's how it's played:
Two teams of three square off in a rapid-fire game of pong, where each player has a 6 cup lifeline (3 can work if the table is small), and no balls are off limit for roll backs (so pay attention to rebounds). The drink-before-you-shoot rule is in play as usual, but there is no "turns", so any team/player can shoot any ball at any time, including passing balls off to their teammates (if for instance their cup is made and they have to drink).
Same Cupping someone is always in play during civil war, allowing a team to come from behind at any point by completely eliminating a player by making two balls into the same cup at the same time. That being said, a player can block a same shot attempt and give the other team the roll back (favorable to being shot out). Given the rapid-fire nature of the game, blocking a same shot attempt doesn't have the same repercussions here that it does in Beer Pong.
The first team to make all of the opposing team's cups wins. As it's extremely unlikely that all three players lose at the same time, when players are knocked out of a game of civil war, they can rebound balls for their team (usually the 50/50 rule is enforced, where they can't step on their opponents side of the room to rebound a ball (but reaching is allowed while feet remain on their side). This adds an additional element of strategy to the game, as it might make more sense to leave a player with 1 cup in the game so he won't focus solely on rebounding after being shot out.
As always, please remember to drink responsibly while enjoying this alcohol drinking game, and please leave feedback in the comments if you enjoyed it!