Set the infection ratio before mapping the route
A campus zombillion run fails most often at the start, when too many zombies are released into a narrow path and survivors bunch up. At a 400-player event, a 1:8 zombie-to-survivor ratio gives enough pressure without turning the first 200 metres into a shoving match. A ratio above 1:6 on a single-width path forces walks rather than chases. Set the ratio in the permit and volunteer plan, then map the course. The takeaway is simple: infection numbers are a safety decision, not a late costume choice.
Use choke points to create decisions, not queues
The bus-stop corner near a sports centre is a useful choke point only if it splits survivor traffic into two lanes. One lane can be a fast, exposed sprint; the other a slower, covered detour. In a test walk-through, a 12-second release interval kept both lanes moving and gave zombie teams a clear target. Place marshals 10 metres before and after the split so they can stop a wave before it compresses. If a checkpoint creates a queue longer than 90 seconds, move it or widen the entry. The solution is to design choices that spread the crowd, not bottlenecks that stop it.
Brief survivors and zombies in separate rooms
Separate briefings protect the game’s information balance. Survivors need the flag rules, emergency exits and the rule that no one is tackled or grabbed. Zombies need the infection window, boundary limits and a clear stop phrase. A five-minute split briefing reduces confusion at checkpoints because each group hears only the rules that apply to its role. Print role cards with three checkpoints and a radio channel so volunteers do not rely on memory. The result is fewer mid-game questions and faster restart times after an infection wave.
Track checkpoint data and debrief within 48 hours
Record arrivals, infection counts and drop-out points at every checkpoint. If a checkpoint loses 30 percent of survivors in one wave, the issue may be visibility or a missing marshal, not difficulty. Compare those numbers with volunteer reports before changing the route. Use a simple tally sheet and a shared timekeeper, because memory drifts once the first wave passes. A short debrief within 48 hours captures details while they are fresh and turns a one-off campus zombillion into a repeatable event with measurable pacing.
Keep the final rule list short enough to remember
A five-rule card works better than a ten-minute speech because players can recall it under pressure. Put the stop phrase first, then the boundary line, the no-contact rule, the flag rule and the emergency exit route. Test the card with a small group and remove any rule that needs a second sentence to explain. Clear rules at the start produce cleaner checkpoints and fewer disputes after the finish.