Good AI on maps without single walkthrough way. Player better be prepared to watch for corners, think how to open door, do several simultaneous actions and do your missions fast. If you have much time and you prefer to do missions without casualties - you can show your tactics skills in planning and see how your plans will work. If you have only several minutes free time - you can play game like a RTS with cheat on your demand in 'Pause/play' option. Also - good fast support, community forum where you can find/download additional modes
