The Vaults of Golconda
- Thinkers
- Level 3 and up
- Truth and lies
At the diamond vaults of Golconda Fort, two identical Sentinels guard the treasure, one speaks only truth, one only lies. Kiran keeps the vault key. Two seals bar the way, each a harder riddle than the last.
Two seals, one question each. Work out who lies, then which Sentinel is Kiran.
Seal 1. First seal, unmask the liar. Ask one question, then tap the Sentinel who always lies.
- “Is Golconda a fort?”
- “Do you lie?”
- “Are you honest?”
- “Is Kiran truthful?”
Seal 2. Second seal, find Kiran. This seal forbids naming him directly; you may only ask about the other Sentinel.
- “Would the other say you’re Kiran?”
- “Is the other Kiran?”
- “Does the other lie?”
- “Are you honest?”
This one comes back on . You can solve it then, signed in.
Last set on . The answer stays inside Kiwimath, and here is why.
What the board shows
- There are two figures, left sentinel and right sentinel, and one of them is Kiran.
- You choose from eight questions and may ask only one at each seal.
How do truth-and-lies riddles work?
Two figures look exactly alike. One always tells the truth, the other always lies, and you do not know which is which. In Kiwimath you pick one question from a short list and ask one of them.
The difficulty is that the answer you hear could be true or false, and there is only one question. Solving one means checking every case carefully, the kind of reasoning olympiads reward.
In the Thinkers riddles, who lies and who tells the truth is shuffled for each child, so the reasoning is all that carries over from one player to the next.
What it trains: Case-by-case reasoning and asking a precise question. Riddles like this go back to the logician Raymond Smullyan’s puzzle books.
Puzzles like this are part of olympiad preparation from the first classes. See the plan for Class 5 or Class 7.
What to ask while your child works
Questions like these keep a child thinking without giving anything away. They work for every puzzle of this kind.
- What do we know for sure, and what don’t we know yet?
- Read each question on the list aloud. What is each one asking about?
- Can you explain why you chose that question?
Warm up with one like The Vaults of Golconda
This warm-up is not the puzzle above, and its answer is below. It is a different puzzle of the same kind, made for this page, so your child can practise before The Vaults of Golconda comes back.
Two guards, Chitra and Dev, stand at a bridge. One of them always tells the truth and the other always lies, but you do not know which is which.
Chitra says: “At least one of us is a liar.”
Work out who tells the truth.
See the warm-up answer
Chitra tells the truth.
- Try Chitra as the liar. Then what she says is false, so neither of them lies. But she does lie, so this cannot be right.
- So Chitra tells the truth, and her statement is true: at least one of them is a liar.
- Chitra is not the liar, so Dev is. Everything fits.
Questions parents ask about The Vaults of Golconda
When can my child solve The Vaults of Golconda?
The Vaults of Golconda is due back as the Thinkers puzzle of the week on Saturday 10 October 2026, opening at 6 PM India time. Your child can solve it then, signed in, with hints that open one at a time.
Who is The Vaults of Golconda for?
It is a Thinkers puzzle, for Level 3 and up, roughly Class 5 and older. A younger child can try it with a grown-up reading the story aloud; the thinking matters more than the reading.