Following is the list of the Hardest In World:
| S.No. | The Hardest In World | Description |
| 1 | The hardest substance in the human body |
Ameloblast cells
|
| 2 | Australia's Hardest Prison | Casuarina Prison |
| 3 | The hardest cyclo-cross race in the world | Three Peaks Cyclo-Cross, (an annual cyclo-cross event over the Yorkshire three peaks of Ingleborough, Whernside and Pen-y-ghent, in Yorkshire, England) |
| 4 | The hardest working cartoonist in history |
C. W. Kahles
|
| 5 | The hardest, longest and most adventurous MTB race | The Crocodile Trophy is an annual mountain bike ten day stage race held in North Queensland, Australia |
| 6 | The hardest bone in the human body | The femur |
| 7 | The hardest form of natural carbon | diamond |
| 8 | The hardest hit ship of the 358th Bomb Squadron (VK-K) | Jersey Bounce |
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