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Change the rules for your game based on the environment and personal needs. Use clothespins instead of weapons to avoid any misunderstandings. Have a "no witnesses" rule to make the game more intense. Establish awards for most kills, most creative assassination, and other achievements.
There are no official rules for Assassin. If one of the rules sounds uninteresting for your playgroup, simply change or remove it. There's no wrong way to play so long as everyone is having fun! If you're nervous about getting in trouble over fake weapons, have each player wear a clothespin on their shirt or belt loop. Each player writes their codename on the clothespin, and players prove they've legally scored a kill by possessing another player's clothespin. Instead of touching an opposing player with your weapon, the goal is to remove the other player's clothespin without them noticing. Requiring players to put the clothespin on their back is a common rule. Colored stickers are a good alternative to clothespins. You can use color-coded stickers to create teams for another variation on the game. At the end of the game, players simply reveal how many clothespins they've captured to determine who the winner is. You can play a variation where any player that assassinates another player is awarded their clothespins. This makes players with a lot of kills a bigger target! Another common modification is to require each kill to take place without the target noticing and without any other players seeing you. If the target spots you, no kills can take place once both players see each other and both parties go their separate ways. If an assassin witnesses another kill take place, the witness is assigned to hunt the attacking player. Don't do this if everyone playing doesn't know one another. It's a bad time to have someone you don't know sneaking up on you. As the director, come up with awards or bonus points for funniest assassination, most creative kill, first blood, or best costume. These kind of awards and bonus points are a great incentive to get players really invested in the game. It's also a great excuse to get everyone together for an awards ceremony where you can discuss the next round!