in "Survive" mode; they are only functional in the Campaign/Story mode. Confirmation
You can find more detailed walkthroughs and secret locations on the Alien Shooter Wiki or through community guides on enter unlock code alien shooter 2 conscription
If the game crashes after you click Unlock, run the game as Administrator (Right-click the .exe > Properties > Compatibility > Run as Administrator). in "Survive" mode; they are only functional in