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
Power Strike is an enhanced multiplayer shooter. Join a server start shooting down your opponents with numerous weapons. Can you win every game? Shoot and aim with the mouse, walk with the WASD and use the number keys for weapons.