Cereal&Milk

PvP doesn't work like that.

When you click on the Sign Up NPC, you're automatically sent to a waiting room-esque loading screen after choosing your room type. When another person clicks on the NPC, they are put through the authentication process. Depending on which type of battle that person picks, they'll end up in a room with you, someone else, or a group of people.

Only worry about someone clicking the NPC at the same time if you want to fight a specific person. PvP fights are randomly assigned.

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