The game features:
- New campaign (three episodes).
- A laboratory (A place where the player can summon monsters and fight them or make them fight each other).
- New HUD.
- New Monsters (around 84).
- New Weapons (around 30).
- New Textures.
- Three different playable characters (Psycho from Blood, Caleb from Blood and Doomguy from Doom).
- 3D Weapons version (a version where the weapons are completely 3D).