1. Adding the finest PC shooters which were released since then
2. A clearer brief in terms of what constitutes a shooter, seeing as we now have seperate stealth, RPG, horror and action lists to provide better homes for genre-blenders.
3. Being a little more ruthless about whats genuinely great to play now, as opposed to being included primarily for their historical importance.
4. Because we want to, and can. Remember: your favourite is at 51. Specifically to spite you.
Oh, and please be aware that, unless expressly mentioned otherwise, the list is not ordered until the top 10. Number 50 is as highly recommended as number 11. This is not the case for all our lists but it is the case here.