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
In Special Strike Zombies you must try to survive against hordes of oncoming zombies. Use multiple weapons to kill your enemies. WASD – Move. Mouse – Shoot. Mouse wheel – Switch weapons. R – Reload. Space – Jump. Ctrl – Crouch.