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
Drive around in a big arena filled with fun and challenging mini-games that you can play. Find fuel so that your vehicle doesn't stop. Drive with the WASD keys and brake with space. Have fun with Stunt Car Arena.