Here’s a clear, helpful, and engaging write-up for I.G.I.-1: I'm Going In (also known as Project I.G.I. ). It explains how to unlock all missions, since the game doesn’t use a traditional level-skip cheat. Unlike most shooters from 2000, Project I.G.I. doesn’t give you a simple “unlock all” button or a chapter select from the start. The game uses a linear save system – you unlock the next mission only by completing the previous one.
Enjoy the stealth, the Soviet landscapes, and that iconic sniper rifle. Mission unlocked. igi 1 how to unlock all missions