Mortyr II is an action game (FPS) released in 2004 by Hip Games. The game was released for PC (Windows).
The game takes place during World War II. You play the British intelligence officer Sven Mortyr. During a mission in Norway, you discover that the Nazis develop a "secret weapon" that they want to use against the enemies of the Reich. As it turns out later, your father was forced to work on a super weapon.
To stop the Nazis from using your weapons and save your father, you'll have to pass 11 levels. On each of them you will be able to use faithfully reproduced rifles and pistols from that period.