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Puzzle: Can you decipher the 3-digit code of this lock without a pen or paper?

This puzzle, shared on Threads, has captivated thousands of internet users. The challenge: to find the password for a simple lock using a series of clues. Easy? Not really. And that’s what makes this riddle so addictive. Posted on Threads, the puzzle immediately stirred uncertainty. Users rushed to propose solutions, each convinced they had discovered the correct answer.

The objective is clear: to guess a three-digit combination from a few clues… but interpreting them correctly is another story.

“Find the password,” the caption announces.

A Short, Almost Innocent Phrase That Triggered An Avalanche Of Debates.

A Little Anecdote…

This type of challenge reminded some users of their childhood memories. One internet user shared the following in the comments:

“This puzzle reminded me of when I tried to unlock the padlock on my secret diary in sixth grade. I wanted to create a code that was ‘impossible to guess.’ In the end, I made it so complicated… that I forgot the combination myself!”

An anecdote that brought laughter, proving that these riddles have the power to unite around a light-hearted moment.

User Reactions

This puzzle has generated an influx of comments, sometimes serious, sometimes humorous:

– “The password is 662,” claims one user.

– Another asserts, “I think the right answer is 062.”

– Yet another proposes: “602, 620, 260, 206, 062, 026… several possibilities exist.”

And You?

Were you able to take on the challenge? Did the lock’s combination stump you… or did you manage to find the answer?

Now, Let’s Reveal The Solution We Found:

Here’s the logical progression, step by step:

From clue 4 (738), we deduce that 7, 3, and 8 are not in the combination.

With clue 1 (682) and the previous point, the only possible digits among 6, 8, and 2 are 6 or 2 (8 is excluded). The clue indicates that one digit is correct and well-placed. Thus, either 6 is in the first position, or 2 is in the third position.

Clue 5 (780) confirms that 7 and 8 are not in the combination (already established), and that among 7, 8, and 0, only one digit is correct but misplaced. Since both 7 and 8 are excluded, 0 must be present but in the wrong position. Therefore, 0 is in the combination, but not in the third position (as it is in the third position in 780, where it is misplaced).

Clue 3 (206) indicates that two digits are correct but misplaced. Since 2, 0, and 6 are tested, and 0 is present but not in the third position, it implies that two among {2, 0, 6} are in the combination, and none are in the same positions as here.

Cross-referencing the information: if 6 were in the first position (based on the deduction from clue 1), then in 206, the 6 (in the third position) would be present but misplaced—acceptable—but it would also require that two digits from 2 and 0 be present (each misplaced).

However, clue 2 (614) states that one digit is correct but misplaced; since 1 and 4 are impossible (3 and 7 are excluded, and 8 is already excluded), the digit that is correct but misplaced in 614 must be either 4 or 1—and 4 has not yet been excluded.

Testing the remaining possibility leads to the combination 042:

682: only the 2 is correct and well placed (in the third position).

614: only the 4 is correct but misplaced (here 4 is in the second position, while in 614 it is in the third, hence misplaced).

206: 2 and 0 are correct but misplaced in this test (in 206, 2 is in the first and 0 in the second position, while in 042 they are in the third and first positions—misplaced).

738: none of 7, 3, or 8 appear in 042.

780: only the 0 is correct but misplaced (here 0 is in the third position in 780, while in 042 it is in the first position—misplaced).

Conclusion: the combination is 042.

Before you go, explore more brain teasers to stimulate your mind by clicking here.