You have read about it. Now watch it move.
Five simulations of the systems developers build on. Each one is a real model — deterministic, replayable, and honest about its approximations — wrapped in a game where breaking things is the point.
- Distributed consensus
Quorum
Keep a replicated store correct while the network lies to it.
- OS scheduler
Quantum
You are the kernel. Keep the interactive tasks feeling instant.
- CPU pipeline
Stall
Write the code and design the chip that runs it.
- Cloud cost
Egress
Run a SaaS for a year. The bill is the boss fight.
- Internet routing
Peering
Run an autonomous system, and keep the CFO happy.
What makes these different
- The visualization is the game. Every number the model computes has a picture. Nothing important happens only in a log line.
- Deterministic and replayable. A run is a seed plus your inputs, so a share link replays exactly what you saw — down to the tick.
- Postmortems, not game-over screens. Every run ends in an incident retro: annotated timeline, contributing factors, and what you could have done.
- Illustrative, not fake. Constants come from published sources and are documented as approximations. None of them claim to measure a real system.