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What if have an option named "timer" in the game setting, and this option will basically add a timer and when the timer goes to 0 the impostor win. The reason for this suggest is because a lot of times, people just stay together, doing the impostor victory impossible and the game boring. With this option , people will have to separate to do the tasks, and it will do the impostor game "vincible". (The players will decide how long the timer will be)

Sorry about my poor english, i did my best here.