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
Dead Zone Sniper is a 3D sniper game where you play the role of an skilled sniper. Your task is to survive each round. Move over the roof and kill the soldiers in yellow suits. Use WAD to move and the mouse to aim and shoot.