When iD released the sequel to their adrenaline-pumping, squeal-inducing, parent-traumatising Doom, they gave the world Doom II. They gave the world more of the same, except one of the weapons had two barrels. Personally, I was most disappointed with Doom II. I felt iD had given me Doom v1.1. Invisible War is not Deus Ex v1.1. In fact, it's visually barely recognisable as Deus Ex. However (and this is a big 'however'), it feels like Deus Ex in every way but one.