[PC, Uplay] Valiant Hearts: The Great War - $5.73 (Was $22.95) - Epic Store

One of the best First World War games I've ever played. Excellent story and pretty easy for almost everyone to enjoy.

From the website:

Valiant Hearts: The Great War
Dive into a 2D animated comic book adventure, mixing exploration, action and puzzles.
Lost in the middle of the trenches, play as each of the 4 strangers, relive the War and help a young German soldier find his love.
Trust your faithful canine companion and send him through barbed-wire obstacles and shell holes to solve puzzles or avoid enemies… Rely on him: this dog will be your best friend!