Project IGI 1 [No Commentary, Hard Difficulty] #1 

It's like half-life and operation flashpoint had a child :D The game is extremely hard. You can't save during missions, enemies hit hard, especially later in the game. It's like Prince of Persia of FPS games, you have to learn every step and die a lot. Also it aged badly, I wouldn't recommend anyone to get into it in 2021. But it's sure fun to watch others play ;)