How to play

• Use the arrow keys ‘↑’, ‘↓’ , ‘←’ , ‘→’ or ‘W’, ‘A’, ‘S’, ‘D’ keys to move the player (red dot) and collect falling hydrogen molecules.
• Different colors of hydrogen molecules represent different production methods, their environmental impacts are reflected by different points.
• Avoid black carbon dioxide molecules from fossil fuels to prevent losing points.
• Collect hydrogen molecules from different production methods to earn points and learn about hydrogen technologies.