Lunar relay outbox

  • Build
  • Light 12
  • Planet

Difficulty 4 of 5

The Moon base chat must answer each message within 300 ms. Every message must also reach the archive on Earth, 1.28 s away one way, within 30 s, and none may be lost. Today the chat waits for Earth on every message.

Play level

SQLUsers5 req/sAPI server1 vCPU · 1 GBPostgres2 vCPU · 4 GB
HTTP/2SQLUsers5 req/sAPI serverPostgres
The board at the start of the level
Light across a planetDrag or use arrow keys to pick a path

Lasers in orbit, New York to London · 7,151 km · 24 ms one way

Goals and limits

p99 latency
under 300 ms
Lost writes
none
Completion time
under 30 s
Monthly cost
under 60 USD/mo
Parts you can add
Message broker, Managed queue, Kafka log, Worker, API server, Postgres, Key-value store
Part limit
5
Traffic
5 req/s

Concepts

How players did

Player results load from the server.

All levels