I'm not very good at coding though I am trying to find more and more stuff to learn about it some, though I doubt I will ever be halfway good as Hell Demon, or some of the others on here. So saying that, I do want to contribute a little to the community, though this post will probably end up being useful to new players than anything. I won't post any codes despite the fact I was originally going to because I'm not too sure about what is widely known yet or not, and I don't want to make it widespread enough for these hacks to be patched quickly by Nexon. I will give names of what they are though, so those of you who know what I'm talking about can easily use them.
Before we get started, there are some things that should be common sense.
1) DO NOT HACK ON PUBLIC BOATS!!! I can not stress this enough.
2) Do not have anyone in your friends list as they can see you quickly putting boat after boat up.
3) Do not brag to the public about how quick you can clear something and draw attention to yourself by doing so.
4) Set the boat on Private Invitation Only so the boat does not show up on the docking list.
Okay, with the groundwork said, where would be the best place to go. Since my GF and I do this together, it may differ from others opinions and what not. This is my opinion and what we found to work for us, so it may not work for others. The best place we found it Challenge of the White Tyrant, the second time you face the giant bear. I know there are stages that give you basically more places that give you more exp or money. We are more interested in the money to but equipment and supplied to craft with.
Anyways, the reason we belive this to e one of the better places for midlevels is the stage itself starts out directly at the bear. There is no room before the bear where you have to kill several mobs in order to advance. For example, we can clear the stage 2 to 3 times during the time it would take to take out the Blood Lord due to the mobs you face before the boss himself.
Okay, now for how to do it quickly and easily. You shouldn't use hacks for every stage, but they do make life easier for the stages where you can't finish. Over using a hack (well besides something like speed running since they move painfully slow without it) can ultimately ruin the experience for you. It is best to enjoy what you can before using hacs and only use them when needed or for making money or getting that level or two needed to continue the story line.
1) Use a timescale hack to speed up the game, it rushes through the little animation and makes everything much quicker.
2) Use a run speed boost if you like, but won't really help.
3) It is best to have an Evie, my GF usually supplies the Evie as it is mostly what she plays. I have a Lan and Fiona so I have to rely on her to kill him thanks to the old hacks being patched.
4) If you don't have an Evie, the other best option that I know is to use the golden balls with a high damage modifacation. I have to do this when she is letting her Evie craft for her expertise and I'm tring to make more money for ingredients for her crafting.
It doesn't take too long andyields a decent payout. I hope this helps some people at least.