Mac OS version

I’m new to Mac’s. Is there a specific version of the OS I need for publishing or any min specs I should be aware of? The machine that is currently available to me is OS 10.5.
Thanks

For iOS development you must have an Intel Mac on 10.6.4, otherwise you can’t even approach it (thats the min you need to use the current iOS SDK from Apple)

Snowleo is required or it won’t run the xcode required for compiling ios games.