For the original intended experience, however, sequential progression is recommended first— Project I.G.I. was designed with escalating difficulty and narrative reveals locked to mission order.
Press Left Ctrl + Left Shift + F9 simultaneously while at the main menu. project igi 1 all missions unlock
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Warning: modifying or replacing game files can corrupt saves or be blocked by antivirus. Back up your game folder and saves first. For the original intended experience