[Mono-osx] Which Mono to download for OS X?

[dgio at users.sourceforge.net]

I see there are three kinds listed:

   -
      - Intel Mac:
Runtime<http://download.mono-project.com/archive/2.10.11/macos-10-x86//MonoFramework-MRE-2.10.11.macos10.xamarin.x86.dmg>
       or SDK<http://download.mono-project.com/archive/2.10.11/macos-10-x86//MonoFramework-MDK-2.10.11.macos10.xamarin.x86.dmg>
   - MonoDevelop <http://monodevelop.com/Download>


Which one am I supposed to download for my Mac if I want to code what this
person did?:

http://judeokelly.com/simple-visual-random-number-test/

Also, I'm completely new at this, and would someone please tell me how
difficult this is going to be...? Thanks.
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