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About Tàn Dǎo Hǎiguītāng

Tàn Dǎo Hǎiguītāng is a single-player deduction game where you solve mysteries by asking questions freely. There are no preset options or fixed question patterns; your partner responds to even unusual questions as you work toward the truth.

Three mystery styles

You can choose from three kinds of mysteries. Clear Soup offers calm, straightforward logic; Red Soup brings unsettling discoveries; and Black Soup explores revelations that may point toward justice or darkness.

Solve each case

Each mystery tests your reasoning and deductive skills, with clues and twists gradually uncovering the answer. One example asks why a fingerprint check repeatedly fails, then succeeds exactly after nine failures.

Hints and rewards

Progress in your deductions earns shells. You can spend shells on hints or buy a key clue directly when you need help.

Frequently asked questions

Steam lets publishers create keys to sell in other shops. Once you activate a key, the game is yours to keep, just like a store purchase.

Disclaimer: CD keys have an inherent 1–2% average failure rate. Check the shop terms for buyer protection info. Steam offers no buyer protection for keys bought in other shops and doesn't refund them.

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