Promise is possibly the most powerful weapon in videogames. The promise and possibilities that a title like BioShock dangles tantalisingly in front of us keeps us all hanging on in there, keeps us believing, keeps us pre-ordering. Even when the shelves are awash with me-too pap, cheap knock-off licensed fodder and hyped sequels, a title like this stands out like a beacon of hope amid a sea of mediocrity. No pressure.