IGI is the first game of such kind that is best in all kinds .Its missions are suprb with good gadjets.With 13 or more levels it is a gud game.But one feed back with igi-1 is that one cannot save it at a particularplace only saved automatically aftter each levels.But igi 2 solve that problem
but igi1 has some problems in its gameplay. like the guards wont respond to a dead body. and they will run in a definite path even if the alarms are sounded.