Think differently: question the brief
Eight short riddles about the rules you were given—and the rules you quietly added yourself. Draw, test, then reveal the hint or answer. No special equipment is needed.
Your rhythm: try → name an assumption → check the exact words → change your approach. Allow 5–10 minutes per puzzle. Mark a step complete when you can explain the change, not just quote the answer.
1. Two cordsLink to step
Two cords hang from a ceiling, too far apart for you to hold both ends at once. They are long enough that a swinging end can pass close to the other cord. You have a pair of pliers. How can you tie the cord ends together without moving their attachment points?
Try: Sketch a sequence of moves, not only the final knot. Assume a cord can swing freely.
Show a hint
Hint: What else can the pliers do besides grip?
Reveal the answer
Answer: Tie the pliers to the end of A and start it swinging. Walk to B, hold B and catch A when it swings close enough; untie the pliers and knot the cords. The tool becomes a pendulum weight.
Bring it to your project: In T17-L03 · Explore What Already Exists Before You Build, which existing tool could play a different role?
Success: You can name the assumed restriction that blocked your first attempt.
2. The elevatorLink to step
A person lives on floor 12. Alone on a clear day, they ride the lift only to floor 7 and walk up. On rainy days they ride directly to floor 12. Why might that happen?
Try: Find one explanation that fits both observations. Is it the only one?
Show a hint
Hint: What does the rain give the passenger?
Reveal the answer
Answer: One possible explanation: they cannot reach the floor-12 button but can press it with a long umbrella on rainy days. Many other explanations could fit; the observations do not prove this one. Ask about the passenger and the lift before treating a story as a fact.
Bring it to your project: T01-L02 · Check AI Output Before Your Team Relies on It starts with separating a plausible explanation from a checked one.
Success: You can give a second explanation or a question that distinguishes two explanations.
3. Which way does the smoke blow?Link to step
An electric train travels north. A strong wind blows east. Which way does its smoke blow?
Try: Decide whether the question's premise is true before calculating anything.
Show a hint
Hint: What makes this train move?
Reveal the answer
Answer: An electric train has no engine smoke of the kind the question assumes. Wind direction is irrelevant. Other sources could produce vapour, but none is specified here.
Bring it to your project: Before asking AI to optimise a workflow, check whether the workflow actually has the problem in the prompt.
Success: You can identify the false premise without inventing a different kind of train.
4. The ladder and the tideLink to step
A ladder hangs from a ship floating freely in the sea. Its rungs are 30 cm apart. The lowest rung is just above the water. The tide rises 90 cm. How many rungs become submerged solely because of the rising tide? Assume the ship remains free to rise with the water.
ship ─── ladder
| rung
| rung
water ~~~~~|~~~~~ ship and ladder float together
Show a hint
Hint: Measure the ladder relative to the ship as well as relative to the water.
Reveal the answer
Answer: None. The freely floating ship rises with the tide, carrying its ladder along. If it were fixed to a quay, the answer would change; that is why the assumption is stated.
Bring it to your project: When a dashboard number moves, ask whether your baseline moved too. This matters in T10-L01 · Ask a Spreadsheet a Question and Check Which Rows It Used.
Success: You can say which reference frame your first answer used.
5. The date on the noteLink to step
On Friday 2 January, you find a note written on Wednesday 31 December: “Our review is the day after tomorrow.” When is the review? Do not use today's date to interpret the note.
Wed 31 Dec → Thu 1 Jan → Fri 2 Jan
note written note found
Show a hint
Hint: Whose “tomorrow” does the sentence mean?
Reveal the answer
Answer: Friday 2 January. “Tomorrow” is relative to the date the note was written, not the date you found it. A year boundary makes the mistaken reference frame easier to notice.
Bring it to your project: A phrase such as “last week” becomes unsafe when a report is rerun. Record a date range in T03-L02 · Build a Context Packet Your Team Can Rerun.
Success: You can rewrite the note without a relative date.
6. The painted cubeLink to step
Paint every outer face of a solid 3 × 3 × 3 cube made of 27 small cubes, then separate all 27. How many small cubes have exactly two painted faces?
Try: Sort the pieces by location: corners, edges away from corners, face centres and the centre.
Show a hint
Hint: How many edges does a cube have? How many non-corner pieces lie on each edge?
Reveal the answer
Answer: Twelve. Each of the 12 edges has one small cube between its corners; that cube touches exactly two painted outer faces. Corner cubes touch three faces.
Bring it to your project: Before counting records, define categories that do not overlap. T10-L02 · Clean a Messy Export Once, So Your Team Can Refresh It uses the same discipline.
Success: You can account for all 27: 8 corners, 12 edge centres, 6 face centres and 1 interior.
7. The river crossingLink to step
A farmer must carry a wolf, a goat and a cabbage across a river. A boat takes the farmer and at most one item. Left alone together, the wolf eats the goat or the goat eats the cabbage. How can all four reach the other bank? The farmer may bring an item back.
Show a hint
Hint: Can a trip in the opposite direction make progress?
Reveal the answer
Answer: Take goat across; return alone. Take wolf across; bring goat back. Take cabbage across; return alone. Take goat across again. At no unattended bank are the dangerous pairs left together.
Bring it to your project: A safe workflow may need a rollback step. Sketch states and a way back before automating a transfer in T05-L01 · Your First Automation: Build It, Break It, Switch It Off.
Success: You can check both banks after every trip, including the return trips.
8. The impossible averageLink to step
You travel the first half of a route at 30 km/h. How fast must you travel the second half to average 60 km/h over the entire route? Average speed means total distance divided by total time.
Show a hint
Hint: Choose a whole route of 60 km. How much time is available for a 60 km/h average?
Reveal the answer
Answer: No finite speed works. A 60 km route must take one hour in total to average 60 km/h. Its first 30 km already took that full hour at 30 km/h. No time remains for the second half.
Bring it to your project: Check whether a target is attainable before asking AI to optimise toward it. T17-L02 · Frame a Problem Your Team Agrees On helps pin down the target.
Success: You can explain the impossibility using time, not just an equation.
Take one insight back
Write down a requirement from your own work, mark which parts were actually stated, and challenge one that you supplied yourself.
Sources and further practice
These are freshly worded teaching versions of classic puzzle families. Source pages can reveal solutions: two cords (opens in a new tab), elevator (opens in a new tab), electric train (opens in a new tab), ship's ladder (opens in a new tab), calendar confusion (opens in a new tab), painted cube (opens in a new tab), river crossing (opens in a new tab), average speed (opens in a new tab). The dated note is our own simple timeline variant.