first it should not have its own leveling system. it should have been based on your gear and level. anyone can enter it but if you were level 5 you wouldn't get far. the structure should have been this. floor 1 easy and as you went up the harder it became so that when you reached 30-40 require a full party or light depending how good you are (not necessary) and 40-50 a 24 man party. floors 30-50 would actually be hard. there would be a mini boss every 5th floor and a big boss every 10th.