Hardcore - Blake Michael Nelson

This boring, breezy life comes to an end, however, when two mysterious men kidnap him and march him through a portal to another world -- a world similar to our own, but which happens to be in the throes of a zombie apocalypse. Thrust into this unbelievable new world, with very few resources and with very little understanding of the situation, Stu quickly finds himself struggling to survive...and struggling to come to grips with the strange "ICON" system, which has somehow been implanted in his brain. The system rewards him with special skills for killing zombies, but killing zombies is the last thing Stu wants to do.

All he wants to do is go home.