Observe the world

System design sparring

Prompts you copy and take elsewhere. Paste one into any large model and it plays the interviewer, asking you through the problem scene by scene rather than reciting the answer.

These prompts only exist in 简体中文 for now.

How to use this

How to start

Pick a question, open it, copy the prompt.
Paste it into a brand-new conversation — not one where you already discussed this question, or the model follows your old answers.
Say nothing. Wait for its first question.

Four commands you can call out at any time

跳过 move to the next scene now
提示 give a direction, not the answer
直说吧 spell this point out in full, then keep pressing on the trade-offs
复盘 jump to the wrap-up and print the review card

Three traps

Don't do two questions in one conversation — context from the first makes the model prejudge your level.
Don't look up the answer the moment it asks. Being stuck for 30 seconds is itself useful information.
When it starts praising you, point it back to rule five — feeling validated crowds out noticing what you missed.

Suggested order: start with the cross-cutting drill as a parts test, use the short-link question to get used to the flow, then pick by the direction you interview for, and keep redoing the one about your own project.