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
Fight with all the heroes of the new Marvel Avengers, entirely in Lego style. Fight against different enemies with all 5 different Avengers. Click on 1 to swap, 2 to jump and 3 to fight.