A free app for Android, by Hidden Object Games – PlayHOG.

This is a very addictive free hidden object game set in a zombie apocalypse era. The game’s main objective is to track and kill patient zero, who’s been at large spreading viruses that cause humans to transform into flesh-eating zombies.

As you play, you must search for 50 hidden objects to unlock a new level. With five difficulty levels, you can expect the game to be more challenging as you progress.

Killing Patient Zero requires careful analysis and critical thinking to find clues in every riddle. Furthermore, the engrossing graphics will instantly make you hooked into the story-game.