Killzone: Shadow Fall udkom i 2013 sammen med PlayStation 4-konsollen, og Horizon: Zero Dawn blev først afsløret ved dette års E3-messe, men alligevel har det sidstnævnte projekt været længst under udvikling hos Guerilla Games.
Dette blev afsløret af Guerilla's medstifter Hermen Hulst i den seneste udgaver af Official PlayStation Magazine, hvor han siger:
"It's been a huge, huge benefit for the studio when starting... Although, well... we actually commenced on the Horizon Zero Dawn project before we commenced on Killzone Shadow Fall. So I was going to say it's been a huge benefit that we started with a mature engine, but the mature engine came into existence whilst the development of Horizon was ongoing! But nevertheless, because we were working on Shadow Fall, of course, to obviously have an engine ready at launch of PlayStation 4 was a boon to us."
Horizon: Zero Dawn udkommer næste år, og det bliver eksklusivt på PlayStation 4.
Tak Games Radar.