SYDNEY: A high-pitched scream pierces the air as a “zombie witch” in a dirty, white dress sprints down a street at a Sydney university, hair whipping around wild eyes as she chases a group desperately scrambling to get out of her way. 

Welcome to “Zedtown” – an adventure event where competitors play out a zombie apocalypse: people race to reach an evacuation point to ensure their survival, but must also avoid being caught and turned by the “undead”.