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How do I move around?

To walk around you can press arrow keys or W,A,S,D.  To jump just press space. You can also move around by simply left clicking at a location. Your avatar will move to that point.

Can I fly?

To fly first press F key. This will hover your avatar, then use the arrow keys to or W,A,S,D. Press E key to fly higher or C to fly lower. To land press F key.