2022 · Spies / Secret Agents
Turing Machine
Question a mechanical, non‑electronic device to deduce a hidden code before the other players. The game simulates a rudimentary computer built from perforated cards and simple components; players pose constrained queries and interpret the machine’s outputs to narrow candidate codes. Play supports competitive head‑to‑head deduction, cooperative team play, and solo challenge modes. Puzzles range from easy to very complex, with millions of possible problems generated by different card and component configurations.
- Players
- 1–4 best 1
- Playing time
- 20 min
- Age
- 14+
- Complexity
- 2.5 / 5
About the game
- Design
- Publisher
Photos from Ludoya tables
All photos in Ludoya
Where to buy it
Shop prices and second-hand copies, checked every day.
On Ludoya's tables
Full stats in Ludoya- 1,910
- Plays logged
- 673
- Players
- 17m 13s
- Average play
- 213
- In collections
- 49
- On wishlists
7.6/10
from 83 Ludoya reviews
This is quite a fun deduction game, particularly once I figured out that you can deduce a lot from the fact that all of the criteria cards are necessary, so you can exclude some possibilities from knowing that. This is one I might be more inclined to play on BGA because of the set up, and because it is a game I tend to want to play over and over.
Rules questions
Answered from the rulebook by Ludoya's rules assistant.
Can I change my 3-card proposal between asking different Verifiers in the same round?
No — you must keep the same proposal for the entire round while you question up to three Verifiers, and record that proposal and all answers on your note sheet (p. 3–4).
How many Verifiers can I question each round — do I have to ask three?
You may question a maximum of three Verifiers per round but you can ask fewer if you wish; you must record the answers you do get as they count toward tie-breaking (p. 3–4).
If a Verifier gives me a ✓, does that mean the revealed number equals the value I showed (e.g., 'it's 3')?
No — a ✓ only means your proposal satisfies the Verifier's hidden criterion (for example, “greater than 1”); it does not reveal the exact value shown in your proposal (p. 3–4).
What happens when someone says they’ve found the code — how do we verify and decide the winner?
Players who think they found the code write it secretly and check the Solutions section or the app; if multiple players are correct the one who asked the fewest questions wins (ties share the win), and incorrect guessers are eliminated while the game continues for remaining players (p. 3).
Do I need to identify every Verifier’s criterion to solve the puzzle, or are some criteria optional?
All Verifiers are essential and none repeat another's information, so you will need the criteria of every Verifier to determine the unique code (p. 3–4).
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Free, on web, Android and iOS
Play Turing Machine with Ludoya
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Game facts (players, playing time, age, credits) from BoardGameGeek.