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- SI physics units
- Transition metals
- Noble gases
- Halogens
- Group I alkali metals
- Group II alkaline earth metals
- Ethane and methane molecules
- Ethanol and methanol molecules
- Water and ammonia molecules
- Alcohol molecules
Click on each puzzle screen to accept the challenge! Reload the game page for a new randomized picture. These Javascript puzzles are best viewed full screen at 1024 x 768 resolution.