🎨 Your Local Sticker Collection
Complete challenges to collect stickers. Progress is saved only in this browser.
All 24 days are open in archive mode
🗂️ Project Update
The live Sustainability Advent Calendar campaign ended on December 24, 2025. We kept the full experience online so new visitors can still learn by playing every challenge.
🎯 What is the Sustainability Advent Calendar?
An interactive learning experience featuring 24 sustainability challenges. Each day includes a puzzle, quiz, or optimization game designed to be both educational and fun. From route planning to renewable energy, from ocean conservation to green building design.
💚 Some reasons behind its creation
Climate change is one of the biggest challenges of our time, but solutions start with awareness and action. Learning shouldn't be boring nor overwhelming. Through simple daily challenges, we want to show that small changes add up and that understanding environmental challenges can be enjoyable.
Why you should give it a try?
- 🧠 Learn through play - Interactive challenges make complex topics accessible
- 🧩 Hands-on practice - Try simulations, quizzes, and strategy games at your own pace
- 🌱 Daily micro-habits - Most challenges take only 1-2 minutes
Good to know
- 🔓 No login required - Jump directly into any challenge
- 🛑 No database writes - Likes, feedback, and leaderboard submissions are disabled
- 💾 Local progress only - Completion stickers are stored in your current browser
- 🍃 For Organizations - If you are interested in participating with some interesting quiz or examples, please reach out! (check the footer)
Ready to start?
Whether you're a student, a professional, or just curious about sustainability, you might enjoy this one!
💡 The best time to start was yesterday. The second best time is today.