: Navigate to where you have Project IGI installed.

: For its era, the sound design is excellent, featuring realistic gunfire and environmental effects like rain that enhance the "lone operative" feel.

Select that profile. Go to the mission selection screen to find all levels instantly available.

This trick works on most IGI 1 versions, including the Ustad portable version, allowing you to bypass any mission.

The Ustad version may require a specific save game format compared to the original retail version. Quick Reference: IGI 1 Mission List

Open the folder named pc and then look for a subfolder named COMMON or SETUP (depending on how Usttad organized the files).

: Drop the downloaded 100% complete file into this folder, confirming that you want to replace the existing file.

It often retains the original, unforgiving difficulty. Why Unlock All Missions in IGI 1?

: If you are currently in a mission and want to bypass it, type nada at the main menu to enable cheats, then during gameplay, use the code imdone to skip to the next level.

Extract the downloaded completed profile and paste it into the \data\mission folder, replacing the existing files.

: Community-provided "Mission Unlockers" typically involve replacing original mission configuration folders (like location zero ) with modified ones that mark the missions as cleared. Backup Warning : Always create a backup of your original folder before replacing any files to avoid game crashes. Common Cheat Codes

Above all, : obtain the game through legal means when possible, scan downloaded files for malware, and enjoy this classic stealth‑action gem in its full, unlocked glory. Good luck, Agent Jones — the nuclear warhead is waiting.