Unlocking the game gives you access to all 14 tactical missions, including: Military Airbase Radar Base Get Priboi Border Crossing Eagle's Nest I & II Finding the Bomb
The portable version might store save data in %AppData%\IGI instead. Check both locations. Also, ensure the file is not read-only. unlock all mission in igi 1 game usttad portable
Successfully applying these methods will grant access to all 14 tactical missions, including: SAM Base Military Airbase GOD Radar Base Get Priboi Border Crossing Re-Supply (noted as the hardest mission) Missile Trainyard Defend Priboi Eagle's Nest I Eagle's Nest II Nuclear Infiltration Finding the Bomb Unlocking the game gives you access to all