Root Needed: Yes
Precautions: Remeber one thing always make BACKUP of your default lib.so file before using library hack
1.Download from the link provided by the author (it's a dropbox link)
2.When done, you should see a rar file by the name "libDungeonHunter4HD.rar" and it should be 8.36mb
3.Extract the rar file and you will get a lib file by the name "libDungeonHunter4HD.so" and the size of this file is 28.76mb
4.Open Root explorer and Copy the extracted lib file and go to the path "/data/data/com.gameloft.android.ANMP.GloftD4HM
5.Open the abovementioned folder and you will see a folder name "lib"
6.Open the "lib" folder and you will see a lib file with the same name to what you had extracted
7.You can just paste over the original lib file but I always delete before I paste
8.Once you are done exit and open your game
9.Go to the shop and under the 1st item which is sword, above is sword with value of gem and below is with value of coins(20,000)
10.Just tap the one with 20,000 coins value n it will say buy it with -xxxxxgems just hit yes and you get lots of gems and just buy anything that uses coins. The max value of gems that you can get is 150million plus.buy all things that you wan't and restore to default original library and you'll be able to use multiplayer.
https://www.dropbox.com/s/3f5kuzqefpkec9o/libDungeonHunter4HD.so in case you forgot to backup(Credits:Ashu)