Instructions
Enter the first large room and head for one of the small rooms at either the left or right. Take out the German soldiers in one of those rooms and you can then flank the covered soldiers in the main room from that position.
Head down the hall towards the next large room and go upstairs to the balcony. Take the sniper rifle at the far right side and take out all the Germans below you.
Follow your group down the stairs to the ground floor. Circle to the left and take out the machine gun near the front using a grenade, then follow the group through the next door.
Go up the stairs and take out the two groups of soldiers looking to ambush you. A grenade will work on most of the first group, which is close by. Use a rifle on the second group.
Head down the hall and crawl up the next flight of stairs to avoid machine gun fire. Stay to the right, taking out the Germans you encounter, and make your way to the small room, where the group rejoins you.
Make your way along the right side to reach the outside balcony. Grab the Russian flag along the balcony's entrance.
Carry the Russian flag all the way to the Nazi flag's location at the roof. Watch the game's final cut scene unfold to show the end of the game.