Add nonfiction books you've read about astronomy, stargazing, light pollution and/or protecting our starry night skies.

Add nonfiction books you've read that talk about ancient history (roughly 4500 BC - AD 600) or historical fiction books you've read that take place in those times.

Add nonfiction books you've read about animals' biology, intelligence, and emotions, their importance and role in the Earth's ecosystem, or that advocate for animal rights.

Add nonfiction books you've read about issues currently faced by children and/or youths, or that talk about education, pedagogy or personal development for them, or about child behavior or psychology.

Reach Marble Myth in 10/13 of the special quests and have at least 100 books read in your library.

Add nonfiction books you've read about world economics, politics, sociology, or international relations.

Add books you've read that have improved your mindfulness, calmness, confidence, self-esteem and overall mental health.

Add nonfiction books you've read that talk about kindness, empathy, compassion, giving, helping others, humanitarian aid, philanthropy, non-profit ventures, selfless acts or heroic deeds.

Add philosophy books you've read and that deepened your understanding of our existence and the meaning of life.

Add nonfiction books you've read that promote anticonsumerism, oppose materialism, or have guided you towards finding happiness in simple living.

Add books you've read that helped you become more efficient and learn more effectively.

Add nonfiction books you've read about health & wellness, longevity, fitness or exercise.

Add books you've read that are related to sports, physical competitions or athletic performance.

Add nonfiction books you've read about business, entrepreneurship, leadership, workplace culture, or business cases.

Add books you've read about plant-based diets. Cook books count, of course! As well as books about crop-growing or that talk about consumable plants and/or fungi.

Add nonfiction books you've read that talk about LGBTQIA+ rights, history, or culture.

Add nonfiction books you've read that have helped you better understand the effects of climate change or reflect on how we can help protect our home planet.

Add nonfiction books you've read that have advanced your understanding of social justice issues or inspired you to work toward positive change.

Share your referral link with 3 reader friends (they have to join and add at least 10 read books to their library to count towards your quest). If you were referred by someone, they already count as 1.

Add books you've read that explore art or performance in any art field.

Add nonfiction books you've read that talk about religion and/or spirituality.

Add nonfiction books you've read that talk about women empowerment or discuss gender inequalities.

Add books you've read that feature a climate disaster, natural disaster, or that take place in a world after one has occurred. The world may also be imaginary.

Add books you've read in a language in which you're only a beginner or intermediate. They don't necessarily have to be originally written in that foreign language, they may be translations.

Add books you've read that helped you discover and learn more about modern (last 100 years) real world societies, countries or cultures (the books may be fiction or nonfiction).