Final success rate of only 0.05%: Answers revealed for the "Hearing Challenge" that sparked a wave of misheard-lyric theories
Audio-Technica's hearing support brand, 'audio-technica MIMIO,' has released the results and answers for its 'Hearing Challenge' campaign. The project aimed to raise awareness about hearing health by presenting a difficult audio puzzle that only 0.05% of participants could solve.
📋 Article Processing Timeline
- 📰 Published: March 30, 2026 at 20:30
- 🔍 Collected: March 30, 2026 at 22:56 (2h 25m after Published)
Audio-Technica Corporation (Headquarters: Machida, Tokyo; President: Kazuo Matsushita) has announced the final results of the "Hearing Challenge," an experiential project launched by its hearing support brand "audio-technica MIMIO" in conjunction with "Ear Day" on March 3rd.
Answers are now available on the "Hearing Challenge" special website: https://audio-technica-mimio-chounanmon.com
Approximately 14,600 people participated in this campaign through outdoor advertising at stations like Hongo-sanchome and various other promotions. Ultimately, there were only 7 successful solvers, resulting in a success rate of 0.05%.
Today, March 30th, we have published the answers on the special website and provided an explanation of the background and intent behind why our company presented an "unsolvable mystery."
■ The goal: An experience of "hearing it, but not being able to solve it"
In recent years, while more people of all ages are feeling that something is "off" with their hearing, these changes are often difficult to notice, and in many cases, people do not take action.
Against this backdrop, audio-technica MIMIO planned the "Hearing Challenge." This project is not merely a quiz campaign, but an initiative designed to make people think experientially about how much attention they pay to their own hearing in daily life.
We hear various sounds in our daily lives, but we unconsciously let most of them pass by. Furthermore, there is a tendency to overlook changes in hearing due to the assumption that "my ears are hearing fine."
Therefore, this project adopted the entertainment format of a "mystery puzzle" with the goal of encouraging people to focus on their hearing through play. We designed the difficulty level so that it could not be solved after just one listen, prompting participants to replay the audio multiple times.
As a result, various "misheard" theories were posted on social media, such as "It sounded like the noise when running a marathon in a nature-rich place where the wind blows through pleasantly," "I can hear animal-like cries and also sounds like a train," and "It sounds like Morse code," creating a circle of deduction among participants.
When participants felt they "could hear it but couldn't solve it," they naturally strained their ears as if to verify the sounds they were missing. That experience of facing one's own sense of hearing leads to an awareness of one's "listening power."
audio-technica MIMIO believes that through the Hearing Challenge, we were able to provide an opportunity for many people to confront their own hearing.
■ Revealing the "Hearing-Through Problem": Overlooking discomfort with one's hearing
In conjunction with this initiative, we conducted a survey on hearing among men and women in their teens to 30s across Japan.
The survey results showed that only 12% of respondents suspected their own hearing decline when they felt it was difficult to hear someone's voice or other sounds. While 44.3% of people have felt that something was "off" with their hearing, it was revealed that only about one in two of those people have visited a medical institution or specialist.
This indicates a reality where many people do not take appropriate action despite noticing changes in their hearing.
Furthermore, when we surveyed whether people would feel a sense of crisis and visit a medical institution if their hearing or vision declined, 45.1% chose vision, while only 28.4% chose hearing, demonstrating a lower level of awareness regarding "hearing."
This suggests that there is a possibility that awareness and action regarding hearing are not sufficiently linked, which supports the significance of this initiative.
―――――
■ Survey Details
Survey Company: JustSystems Corporation
Survey Period: March 24, 2026 – March 26, 2026
Survey Method: Internet survey
Target: Men and women in their teens to 30s
Valid Responses: n=467
Response Format: Single choice, multiple choice
―――――
■ Explanation of the "Hearing Challenge"
The special website also provides technical explanations of how the puzzles were constructed.
The problems were designed to be solved by clearing three different "hearing" themes in sequence. The first theme required distinguishing between high-frequency and low-frequency sounds. Within the ambient sound playable on the site, 80Hz low-frequency and 12kHz high-frequency sounds were placed at a regular tempo; by hearing these differences, a binary code emerged.
In the next theme, participants had to focus on two types of bell sounds (large and small) hidden within ambient sounds recreating Lake Tekapo in New Zealand, and by distinguishing the difference in volume, a sequence of numbers was derived.
In the final theme, it was necessary to isolate and listen to three sounds played simultaneously. The mechanism required decoding the meaning of a voice reading an address, a reversed audio track, and a countdown voice to arrive at the final answer.
◇ Hearing Challenge Production Team
The "Hearing Challenge" project was produced from both acoustic design and puzzle-solving structure perspectives.
Acoustic design was handled by A to Z Studio, a sound designer active in a wide range of fields including advertising, video, and installations. The puzzle creation was handled by a creator specializing in logical thinking and structural design, who is also a member of JAPAN MENSA. In this project, by leveraging these intellectual backgrounds, the thought process and problem structure for decoding information from sound were designed.
■ About JAPAN MENSA
MENSA is an international group founded in the UK in 1946 that anyone can join if they possess an IQ in the top 2% of the general population. MENSA is an international group with over 100,000 members in more than 100 countries worldwide. MENSA provides a place for intellectual exchange among members. Its activities include lectures, meetings, newsletters, special interest groups, and exchanges through local, national, and global events. It also cooperates with researchers inside and outside of MENSA on projects related to intelligence.
There are over 150,000 members in more than 100 countries worldwide. It has branches in about 40 countries on every continent except Antarctica. There are over 7,000 members in Japan (as of the end of March 2025).
■ About "audio-technica MIMIO"
Bringing color and joy to daily life through hearing.
audio-technica MIMIO is a new brand born to expand the possibilities of hearing, inheriting the DNA of audio-technica, which has continued to be particular about sound.
By staying close to the hearing that changes with age and environment, and delivering sound gently to the ears, we provide a rich and comfortable sound experience for everyone.
Bringing color and joy to daily life through hearing, and creating smiles and happiness for people. That is our mission.
Official Website: https://www.audio-technica-mimio.com
Inquiries regarding this project:
"Hearing Challenge" Inquiry Office
MAIL: Nanmon_ChallengeCP@vectorinc.co.jp
Answers are now available on the "Hearing Challenge" special website: https://audio-technica-mimio-chounanmon.com
Approximately 14,600 people participated in this campaign through outdoor advertising at stations like Hongo-sanchome and various other promotions. Ultimately, there were only 7 successful solvers, resulting in a success rate of 0.05%.
Today, March 30th, we have published the answers on the special website and provided an explanation of the background and intent behind why our company presented an "unsolvable mystery."
■ The goal: An experience of "hearing it, but not being able to solve it"
In recent years, while more people of all ages are feeling that something is "off" with their hearing, these changes are often difficult to notice, and in many cases, people do not take action.
Against this backdrop, audio-technica MIMIO planned the "Hearing Challenge." This project is not merely a quiz campaign, but an initiative designed to make people think experientially about how much attention they pay to their own hearing in daily life.
We hear various sounds in our daily lives, but we unconsciously let most of them pass by. Furthermore, there is a tendency to overlook changes in hearing due to the assumption that "my ears are hearing fine."
Therefore, this project adopted the entertainment format of a "mystery puzzle" with the goal of encouraging people to focus on their hearing through play. We designed the difficulty level so that it could not be solved after just one listen, prompting participants to replay the audio multiple times.
As a result, various "misheard" theories were posted on social media, such as "It sounded like the noise when running a marathon in a nature-rich place where the wind blows through pleasantly," "I can hear animal-like cries and also sounds like a train," and "It sounds like Morse code," creating a circle of deduction among participants.
When participants felt they "could hear it but couldn't solve it," they naturally strained their ears as if to verify the sounds they were missing. That experience of facing one's own sense of hearing leads to an awareness of one's "listening power."
audio-technica MIMIO believes that through the Hearing Challenge, we were able to provide an opportunity for many people to confront their own hearing.
■ Revealing the "Hearing-Through Problem": Overlooking discomfort with one's hearing
In conjunction with this initiative, we conducted a survey on hearing among men and women in their teens to 30s across Japan.
The survey results showed that only 12% of respondents suspected their own hearing decline when they felt it was difficult to hear someone's voice or other sounds. While 44.3% of people have felt that something was "off" with their hearing, it was revealed that only about one in two of those people have visited a medical institution or specialist.
This indicates a reality where many people do not take appropriate action despite noticing changes in their hearing.
Furthermore, when we surveyed whether people would feel a sense of crisis and visit a medical institution if their hearing or vision declined, 45.1% chose vision, while only 28.4% chose hearing, demonstrating a lower level of awareness regarding "hearing."
This suggests that there is a possibility that awareness and action regarding hearing are not sufficiently linked, which supports the significance of this initiative.
―――――
■ Survey Details
Survey Company: JustSystems Corporation
Survey Period: March 24, 2026 – March 26, 2026
Survey Method: Internet survey
Target: Men and women in their teens to 30s
Valid Responses: n=467
Response Format: Single choice, multiple choice
―――――
■ Explanation of the "Hearing Challenge"
The special website also provides technical explanations of how the puzzles were constructed.
The problems were designed to be solved by clearing three different "hearing" themes in sequence. The first theme required distinguishing between high-frequency and low-frequency sounds. Within the ambient sound playable on the site, 80Hz low-frequency and 12kHz high-frequency sounds were placed at a regular tempo; by hearing these differences, a binary code emerged.
In the next theme, participants had to focus on two types of bell sounds (large and small) hidden within ambient sounds recreating Lake Tekapo in New Zealand, and by distinguishing the difference in volume, a sequence of numbers was derived.
In the final theme, it was necessary to isolate and listen to three sounds played simultaneously. The mechanism required decoding the meaning of a voice reading an address, a reversed audio track, and a countdown voice to arrive at the final answer.
◇ Hearing Challenge Production Team
The "Hearing Challenge" project was produced from both acoustic design and puzzle-solving structure perspectives.
Acoustic design was handled by A to Z Studio, a sound designer active in a wide range of fields including advertising, video, and installations. The puzzle creation was handled by a creator specializing in logical thinking and structural design, who is also a member of JAPAN MENSA. In this project, by leveraging these intellectual backgrounds, the thought process and problem structure for decoding information from sound were designed.
■ About JAPAN MENSA
MENSA is an international group founded in the UK in 1946 that anyone can join if they possess an IQ in the top 2% of the general population. MENSA is an international group with over 100,000 members in more than 100 countries worldwide. MENSA provides a place for intellectual exchange among members. Its activities include lectures, meetings, newsletters, special interest groups, and exchanges through local, national, and global events. It also cooperates with researchers inside and outside of MENSA on projects related to intelligence.
There are over 150,000 members in more than 100 countries worldwide. It has branches in about 40 countries on every continent except Antarctica. There are over 7,000 members in Japan (as of the end of March 2025).
■ About "audio-technica MIMIO"
Bringing color and joy to daily life through hearing.
audio-technica MIMIO is a new brand born to expand the possibilities of hearing, inheriting the DNA of audio-technica, which has continued to be particular about sound.
By staying close to the hearing that changes with age and environment, and delivering sound gently to the ears, we provide a rich and comfortable sound experience for everyone.
Bringing color and joy to daily life through hearing, and creating smiles and happiness for people. That is our mission.
Official Website: https://www.audio-technica-mimio.com
Inquiries regarding this project:
"Hearing Challenge" Inquiry Office
MAIL: Nanmon_ChallengeCP@vectorinc.co.jp