I keep hearing "Minecraft" this and "Minecraft" that (in highly good ways), and it does look interesting. So I have questions questions that I could not seem to fine via Google:

1. Is there a "sandbox" mode that is already unlocked, or do you have to complete the "Story/Campaign" first?

2. I've read reviews, people's comments and even the game info and still am lost as to the point of the game, other than the fact that there are zombies or enemies at night (if that is even correct).

3. If there is a sandbox mode, can I "disable" the enemies so I have free reign on building stuff without being interrupted?

4. If there is a sandbox mode, can I "fly" if I choose to build skyscrapers, or is the only way to reach the sky is via building steps?