Flatten the Curve
The server picks how contagious a disease is, how long people stay infectious and how many are ill at the start, plus a target band for the most people ill at once (always achievable), you set the share of people vaccinated, and a real epidemic model judges the run. Landing the peak in the band refunds your run.
About this simulation
What it shows
A puzzle on an outbreak in a group of 1000 people: how contagious the disease is, how long people stay infectious and how many are ill at the start are given, along with a target band for the most people ill at once. You choose what share of people are vaccinated, then run it.
The key idea
Vaccinated people cannot catch or pass on the disease, so they act as a barrier between the people who can. The more people are vaccinated, the fewer are ill at the same time, and the lower the peak of the outbreak.
Try this
Run it once at the starting share and see whether the peak is higher or lower than the band, then raise or lower the Vaccinated slider until the peak lands inside the band.