Download Link = http://www.crydev.net/dm_eds/download_detail.php?id=4
Playing sandbox 3 SDK editor on highest settings
just showing the beautiful forest that cryengine 3 can do.
enjoy 🙂
and yes you can build your own map with it
and you dont need crysis 2 to play this
it comes with this one forest map that you can edit
or you can do complitly new map.
source