Step by step instructions with pictures.
Tools needed: Computer
Brain
MapleStory wz files
In this tutorial, I will teach you how to make Godmode, Invisble Yeti, Bonus yeti freeze and Vac.
Warning: Do not try to use this on other mobs that are not in the pq.
Before continuing, make sure that you have backup-ed your wz files, we'll be using Mob.wz.
First thing you need to do, is obviously to open the Repacker. Note: If you are using windows Vista/7, remember to run as administrator.

After that, you press File>>Load. Make sure that you choose BMS before you load.

Then just choose to open Mob.wz

Now the first hack we're gonna make is godmode. Which should be easy.
Just find and expand 9700004.img, expand info and find bodyAttack.

After highlighting bodyAttack, press Ctrl+M to change the value of bodyAttack to 0.

Then do the same thing to everything in between 9700004 and 9700029. Which is quite alot.

After doing all that, Congratulation! You've made godmode.
Next, we'll make invisible yeti, find 9700021.img and remove(Use Ctrl+R) all property except info and stand.

Then expand info, and find speed.

Then press Ctrl+M after highlighting speed, and change its value to -99999.

Congratulation, you've made invisible yeti!
(Optional)Next, we're gonna Vac hack. It only works when the yeti is there.
This is easy, just find 9700021.img>>info and press Ctrl+A and fill it in with these settings:

Congratulation, you've made the Vac hack.
Next part, is the Bonus Yeti Freeze. This stops the yeti in the bonus stage from moving around, which makes it easier for you to kill and collect them.
Just find 9700019.img, and remove(Ctrl+R) everything under that, except info and stand.

Congratulation! You've made all the hack in this tutorial!
But wait! Don't leave yet! You need to save it for it to work.
So for those people who do not know how to save, here's a small tutorial.
Press File>>Save.

For this tutorial, we'll be saving Mob.wz, so choose Mob.wz.

Then this message will come up, just press Yes.

Then something else pops up. Just make sure that its BMS, and the number there is your current version. 97 means that this is v0.97. After checking that, just press Save.

Repacker will hang after you press Save, just leave it there till its done.
Congratulation! You've made your own Netts Pyramid hack!
-ShiunYean
Don't leech my tut!