End of the twentieth century... Scientists were able to open a portal to another world. Something went wrong and now portals keep opening up all over the planet. Don't let anyone go through them!

Forbidden Ingress is a first-person shooter where you have to fight a gaggle of demons and other monsters.
Build fortifications, place turrets, buy weapons. Hold out as long as possible!

Weapons

22 weapon units - from knives to blasters ...

Construction

You can build a base for protection from monsters.
Walls, doors, windows, pales, traps, turrets, RPGs, lasers ...