And why not, they seem to be everywhere else.
Nemesys Games included a hidden zombie mode in their Qix gameplay-based Fortix 2 on Steam. Those sneaky devs. But the secret is out now and players can access the slow, shambling hordes of the Undead by simply “harassing the semi-musical bird on the title screen”. After activating Zombie Mode Unleashed via the birdie, a button will be available at the bottom of the screen for easy switching between the game modes.