The latest issue of Game Informer has a heap of info regarding Epic Games’ upcoming Unreal Engine 4-powered multiplayer sandbox survival title Fortnite.

There are three campaigns in the game so far, which stretch for 10, 20, and 50 hours in length respectively. Each stage is procedurally-generated with destructible elements, and players must work together to scavenge crafting material to build up and repair their forts before nightfall.

The enemy in Fortnite are demons that spawn from portals in storm clouds that can be closed using a device called Atlas. Gameplay-wise, comparisons have been made to Gears of War’s over-the-shoulder perspective and horde mode mechanics.

Forts, tools, and weapons can be crafted from wood, rocks, scrap metal, and more, and resources can be gifted to others.

Traps that may be constructed include spikes, electric surfaces, auto-turrets, poison gas clouds, and explosive mines.

Four classes have been revealed: the Constructor builds faster and uses fewer resources; the Ninja has a double-jump, strong melee attacks, and upgradable katanas, throwing stars, and smoke bombs; the Commando is good with guns; and the Scavenger gathers resources much faster than the others.

New classes will be added over time, said Epic.

Fortnite will use a free-to-play business model, and is due out this year for Windows PC.

Sign-ups for the game's alpha are open now.