1. The requirement for each hat is available at the above site, although some requirements are secret.
2. The requirements for each hat are available at the above site, although some requirements are secret.
3. Requirements for each hat are available at the above site, although because some hats are secret, not all hats nor the requirements for such are listed.
4. Each hat’s requirement is available at the above site, although some requirements are secret.
5. All hats’ requirements are available at the above site, although some requirements are secret.