| # | title | topic | type | difficulty |
|---|---|---|---|---|
| 1 | Six connections, they said | WebSockets | Multiple choice | Hard |
| 2 | The header you cannot send | WebSockets | Multiple choice | Hard |
| 3 | The close code nobody sent | WebSockets | Multiple choice | Hard |
| 4 | send() never says no | WebSockets | Multiple choice | Hard |
| 5 |
| Connected to nobody |
| WebSockets |
| Multiple choice |
| Hard |
| 6 | Every client came back at the same instant | WebSockets | gap | Hard |
| 7 | Two hours after the incident, it happened again | WebSockets | gap | Hard |
| 8 | The reconnect that waited for an event nobody delivered | WebSockets | Multiple choice | Hard |
| 9 | The hotel wifi and the dead server look the same | WebSockets | Multiple choice | Hard |