“In The Event Of Zombies Use Portals” by Lee Byway.
So you’ve been holed up in the Aperture Science Enrichment Centre for some time now, a test subject with the elusive promise of cake and a portal gun.
Yet while you’ve been in isolation busily solving puzzles by jumping through portals the outside world has succumb to the inevitable zombie apocalypse.
Armed with nothing but a portal gun, how long can you outwit, outplay and outlast when the living dead finally take the lab in their quest for brains.
Portal meets Zombies in this apocalyptic mash-up.
Available from RedBubble.