on the number of players at the university, the game may start with more than one original zombie. Also, the amount of time varies as well as the time each zombie has to get at least one bite before dying. Some administrations bring players back, traditionally as a zombie, in order to make the final mission, objective, or overall finale more interesting. The rules for zombies are also known to change in storylines, traditionally after completed missions. This can include alternate stun times, transformation times, or death times. These possibilities make a zombie generally more directly affected by stories than humans. Non-Players People who are not registered players are not allowed to interfere with gameplay. Under the original rules, this includes spying on the other team, or helping players stay in a safe area by bringing them food or doing something for a player which would otherwise require them to leave a safe-zone. If a non-player is shot with a Nerf dart or attacked by a player in any way, they should report the player(s) involved if the incident was intentional. Players who attack non-players will be banned under most rules. The original rules, and most University custom rules, stress the importance of safety in the game. The rules stress the safety of the players and non-players by not allowing realistic looking weaponry, weaponry which could hurt on impact, or dangerous behavior during gameplay. Safe zones Since Humans vs. Zombies can last for days, rules establish "safe zones" where gameplay does not take place, and where players can stop participation in the game for a certain period. Safe zones are designated by the administrators in conjunction with University rules and/or other applicable rules. Safe zones include dorm rooms, bathrooms, dining halls, Academic buildings, Health centers and other such places. Safe zones vary by the rules set at each separate University. Some include every building on the campus and all vehicles, others may exclude some, but not all buildings and vehicles. Players are also considered safe attending a mandatory academic or athletic event. They are not safe, however, going to or coming from these events. Some colleges also consider a "wheel rule" where players are in a safe zone if they are on a skateboard, bicycle, or wearing rollerblades. Generally, HvZ is played on-campus, so off-campus is considered a safe zone as well. Under the original rules, however, all Humans must