21 Combinations in the Primary Substances category:
| 1. Carbon |
| 2. Carbon Dioxide |
| 3. Chlorine |
| 4. Clay |
| 5. Electricity |
| 6. Helium |
| 7. Hydrogen |
| 8. Ice |
| 9. Limestone |
| 10. Magnet |
| 11. Methane |
| 12. Natural Gas |
| 13. Oil |
| 14. Oxygen |
| 15. Plutonium |
| 16. Radioactivity |
| 17. Salt |
| 18. Sand |
| 19. Steam |
| 20. Stone |
| 21. Uranium |