Supported by The Nippon Foundation's "Ocean and Japan Project" Earth Academy & BlueHub Certification 日本語EN中文

Explore, Learn, and Share Stories of Our Blue Planet.

Dive into the ocean with Dr. Turtle

A whole-earth learning adventure —
the more you learn, the deeper you dive.

Not just the ocean — forests, wildlife, climate, and energy too. 12 themes × three levels explain the natural world.
Collect friend cards by acing quizzes, and try the real-photo Discovery Quiz.
Then earn a title with the BlueHub Certification!

Your diving record The more you learn, the deeper you can dive
0m (0%)
Themes learned 0/36 Quizzes passed 0/36 Exams passed 0/3 Friends 0/36

Choose your level

Start with "Beginner." Once you're comfortable, challenge Intermediate and Advanced!

Beginner・Your first steps into the ocean Ages 6–9 (roughly)
Intermediate・Going deeper into the ocean Ages 9–12 (roughly)
Advanced・Mastering the ocean Junior high school and up

BlueHub Certification Beginner

A total of 80 questions from 12 themes. Score 80% (64 correct) to pass!
If you pass, you'll earn the title of "Dr. Shoreline" and a certificate.

🚀 Take the exam We recommend learning the themes below first!
Dr. Shoreline

🌊 Ocean Themes（Beginner）

Tap a card to start an easy explanation and a check quiz.

Ocean Life
Learn →
Plastic Waste & the Ocean
Learn →
The Warming Ocean
Learn →
The Mysterious Deep Sea
Learn →
Secrets of Coral Reefs
Learn →
The Ocean & Our Lives
Learn →

🌍 Earth Themes（Beginner）

Beyond the ocean lie forests, skies, and the web of life.

Forest Life
Learn →
Secrets of the Web of Life
Learn →
The Changing Climate
Learn →
Vanishing Creatures
Learn →
Waste & Recycling
Learn →
Energy & Our Lives
Learn →
🆕 New Corner

🔭 Earth Creatures Discovery Quiz

Meet the world's rare creatures through real photos, not illustrations. Guess their names to add them to your guide — celebrating their charm, not just the challenges they face.

🔭 Start the discovery quiz

Earth Friends Field Guide 0/36

Answer all 5 check-quiz questions correctly to earn a friend card. Collect all 36 to complete your field guide!

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Ocean Life
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Ocean Life
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Ocean Life
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Plastic Waste & the Ocean
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Plastic Waste & the Ocean
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Plastic Waste & the Ocean
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The Warming Ocean
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The Warming Ocean
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The Warming Ocean
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The Mysterious Deep Sea
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The Mysterious Deep Sea
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The Mysterious Deep Sea
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Secrets of Coral Reefs
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Secrets of Coral Reefs
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Secrets of Coral Reefs
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The Ocean & Our Lives
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The Ocean & Our Lives
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The Ocean & Our Lives
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Forest Life
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Forest Life
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Forest Life
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Secrets of the Web of Life
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Secrets of the Web of Life
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Secrets of the Web of Life
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The Changing Climate
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The Changing Climate
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The Changing Climate
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Vanishing Creatures
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Vanishing Creatures
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Vanishing Creatures
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Waste & Recycling
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Waste & Recycling
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Waste & Recycling
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Energy & Our Lives
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Energy & Our Lives
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Energy & Our Lives