A Strength level is sometimes needed to force the bar on a barred door or push a barrel in a puzzle room. Some doors have a requirement of level 99 and higher strength to open. This is not a glitch; by drinking potions you may obtain the level required to open the door. However, doors with requirement of level 100 or more are not strictly members only, as they have been encountered in free to play worlds when soloing dungeons. As the player needs to use potions to get through this door, only members can pass a door with a level requirement of more than 100.