Nightmares in my head.

What genre?

inb4minecraft

























MINECRAFT

already have minecraft.
Preferably fantasy or Sci-Fi.

TF2, it's 3D. :|

@Superb He said fantasy or Sci-Fi and that's a fps...it's still a great game though.

Preferably, not exclusively. ;D

I'd go with TF2. Free 3D games that are good are hard to come by...