The Crysis map editor for the recently release demo.
Sandbox 2 is the level editor included with the game Crysis that enables the construction of maps and mods for the CryENGINE2 3D environment technology.
Such levels will have full support in all multiplayer modes. This will allow the player to easily build their own levels, and even spawn themselves inside to test it. The editor will be the same one that was used by Crytek to create the game.