Killzone creator Hermen Hulst has said Guerilla is strongly influenced by the storytelling of Half-Life and Uncharted, with the latter setting "a new bar".
"In terms of the most influential games for us at Guerrilla, the first one has to be Half-Life," Hulst told Official PlayStation Magazine.
"Just because of the sheer quality of the implementation of the first-person experience, and also the variety in there and the storytelling.
Hulst listed the Uncharted series as a second source of inspiration, heaping praise on Naughty Dog.
"Those guys set a new bar for character development and storytelling, and it's something we all have to try and match," he said.