Number 4 is a very intense shooter, and only those who are determined enough will be able to complete this game. (sploder.com)
A visceral, intense shooter with well designed and realized levels, and certainly a «must have» title for FPS aficionados. (metacritic.com)
Providing 100 levels of intense shooter action that gets more difficult as you advance through the levels is a throwback to when games didn't offer saves at regular intervals and if you quit the game, the next time you played you had to start all the way from the beginning. (thatvideogameblog.com)