Minecraft wiki entry for Things_not_to_do, associated text: Some people may ask players to try extreme challenges, such as no armor challenge, half heart hardcore, wooden tools only, etc. It is not recommended to do these challenges in hardcore, unless you created a backup or is experienced enough. If you are trying half heart hardcore, don't do it on a world you care about because it is extremely easy to die. If you are doing extreme challenges on a server because another player asked you to do so, you can usually reject the request. However, if you accepted, be sure to bring another person to watch and/or bring safety precautions (totem of undying, potions).