From GameWatcher: “It shouldn’t be a surprise that Generation Zero’s robotic opposition is best dealt with alongside a friend or three. From distracting foes to straight out just providing more firepower, it’s quite nice to not be the sole squishy meatbag running through forests and shooting down robots. But while co-op support is in place, and encouraged, is Generation Zero cross-platform?”
Source: N4G PC Generation Zero Cross-platform – Is Cross-platform Play Supported?