Musical Chairs

The reliability team armed the chaos rig against your checkout pool. It kills one instance at a time, and holds each one down for the rest of the exercise. The drill is scheduled over the night's big sale. Most of the crowd is just browsing seat maps, a minority is mid-checkout with money. The Job: The reaper takes your checkout chairs one by one. There will not be enough seats for everyone. Decide who stands.

Free to play, no account needed. A deterministic engine grades your design against this scenario's SLA - error rate, latency, and cost.