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
Race your motorbike through a wide terrain in this amazing 3D motorcycle simulator. No one will stop you as you race at high speed or making wheelies. Use the arrow keys to drive, Space to brake and shift to create wheelies.