The title, published by Electronic Arts, takes place during World War I and recreates harrowing battles, something that excited O'Brien.
"I am genuinely excited at last. Finally a video game I've heard about but I really wanna play," the comedian said, noting his love of history.
"It's actually the most beautiful thing I've ever seen," Crews says enthusiastically.
The pair are then quickly launched into a visceral battle filled with bombs exploding, tanks passing by and airplanes taking to the skies.
O'Brien is seen getting really excited as he takes down a Zeppelin while piloting an airplane. Once the virtual smoke cleared from the game, he gave the title a glowing review, saying, "Battlefield 1 will make you want to urinate it's so good," a reference to Crews having to use the bathroom afterwards.