1. Human monsters get together in the camp for missions and the map is complex. At the beginning, most of missions can be done by single person. Just little part of them need to be done by team. But in the final part( around level 30), most of the monsters is level JY, single person can not solo. So these places are not suitable for leveling.

2. The monster do not get together in the open air. Most of them are animal monsters, but not human monsters. And the monsters? level get lower every one level than the character, 1/4 experience gone. But if you want to level it by killing the monster, you will kill the level 1-2 monsters. Or most of your time will be for rest. So level it by monsters influences the whole progress and much less than that you finish missions. According to a research, two level 17 characters leveling at the same time. One level by monsters, 12 hours later, level to level 18.5. the other one do it by team, and level to 20.

Gold problem. Around level 25, most of the missions are team tasks. Now, it is very slow to level. So we test by it. Speaking theorily, character of 25 level in the open air and kill the monsters lower than them 2-3 levels, they will get 200 every hour. But there is the problem that you have to pay to fix the items. The fee depend on the items? level and keep not death, it will last 3-4 hours. Then we know 150 for each hour. Fighter 25 is 150S*24=3600S=3.6G （1G=1000S）. this is a BUG way! It is great!

We all know level in the open air and kill the ghost will get a lot. 18 skeleton will get 5-6 G in an hour. Here you can level to 25. in 12 hours , you can get 8 G. then you can go to kill human monster. 45 minutes you can get 350s+, 28 can go to book 2, there you can get 8-9 G a day. 38 go to book 3, 12 G for a day. 45 go to the cave, 20 G for a day.