Here, I will Show You Steep by Steep Installation process of Most Popular Open Source Game Engine cocos2d-x 3.9 on Mac OSX
Please Download & Extract those Files onto a single folder of your choice.
ADT Download Link: https://dl.google.com/android/adt/adt-bundle-mac-x86_64-20140702.zip
NDK Download Link: https://dl.google.com/android/ndk/android-ndk-r9d-darwin-x86_64.tar.bz2
Ant Download Link: http://archive.apache.org/dist/ant/binaries/apache-ant-1.9.4-bin.zip
Cocos2d-x http://www.cocos2d-x.org/filedown/cocos2d-x-3.9.zip
It should look line this

Please Download & Extract those Files onto a single folder of your choice.
ADT Download Link: https://dl.google.com/android/adt/adt-bundle-mac-x86_64-20140702.zip
NDK Download Link: https://dl.google.com/android/ndk/android-ndk-r9d-darwin-x86_64.tar.bz2
Ant Download Link: http://archive.apache.org/dist/ant/binaries/apache-ant-1.9.4-bin.zip
Cocos2d-x http://www.cocos2d-x.org/filedown/cocos2d-x-3.9.zip
It should look line this
Now locate the setup.py inside cocos2d-x folder
Now open the Terminal app, Drag the setup.py into terminal app window as follows, press Backspace & Enter
Now Drag the android ndk folder into the terminal window, hit Backspace & Enter
Now drag adt bundle/ sdk folder into the terminal window, hit Backspace & Enter
Now drag apache ant/ bin folder into terminal window, hit Backspace & Enter
Now write "source /Users/YourMacUserName/.bash_profile" and hit Enter
Voila, You have successfully completed the installation process of cocos2d-x 3.9!
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