Chrome 42+ disables NPAPI plugins like Unity3d plugin.
Copy and paste the following text into your browser: chrome://flags/#enable-npapi and enable the NPAPI plugin.
Or try another browser like Firefox
It's time to shoot some zombies in Zombie FPS Range! Protect yourself in a small cabin by shooting down the attacking zombies. Earn money and buy weapons. Walk with the WASD keys and shoot with the mouse.