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
Kuxtal is an awesome 3D platform game where you have to go looking for 24 crystals scattered over a large area. Can you get them all? Use your left mouse button and the WASD keys to move.